C.3 Wave phenomena

Show that, when sound travels from clay to sandstone, the critical angle is approximately 40°.

Show that, when sound travels from clay to sandstone, the critical angle is approximately 40°.

Show that, when sound travels from clay to sandstone, the critical angle is approximately 40°.

The angle between the clay–air surface and path 1 is 80°.

Draw, on the diagram, the subsequent path of a sound wave that travels initially in the clay along path 1.

The angle between the clay–air surface and path 1 is 80°.

Draw, on the diagram, the subsequent path of a sound wave that travels initially in the clay along path 1.

The angle between the clay–air surface and path 1 is 80°.

Draw, on the diagram, the subsequent path of a sound wave that travels initially in the clay along path 1.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The intensity of light at point O is $I_0$. The distance OP is $x$.

Sketch, on the axes, a graph to show the variation of the intensity of light with distance from point O on the screen. Your graph should cover the distance range from 0 to 2$x$.

The intensity of light at point O is $I_0$. The distance OP is $x$.

Sketch, on the axes, a graph to show the variation of the intensity of light with distance from point O on the screen. Your graph should cover the distance range from 0 to 2$x$.

The intensity of light at point O is $I_0$. The distance OP is $x$.

Sketch, on the axes, a graph to show the variation of the intensity of light with distance from point O on the screen. Your graph should cover the distance range from 0 to 2$x$.

A ray of light enters from air into a water droplet of radius $r$ at point S. S is a vertical distance $h$ from the centre of the droplet. The droplet has a refractive index $n$ and the angle of refraction is θ.

What is sin θ?

A.  $\frac{nh}{r}$

B.  $\frac{r}{nh}$

C.  $\frac{h}{nr}$

D.  $\frac{nr}{h}$

A ray of light enters from air into a water droplet of radius $r$ at point S. S is a vertical distance $h$ from the centre of the droplet. The droplet has a refractive index $n$ and the angle of refraction is θ.

What is sin θ?

A.  $\frac{nh}{r}$

B.  $\frac{r}{nh}$

C.  $\frac{h}{nr}$

D.  $\frac{nr}{h}$

The speed of sound in air is 340 m s⁻¹ and in water it is 1500 m s⁻¹.

Discuss whether the sound wave can enter the water.

The speed of sound in air is 340 m s⁻¹ and in water it is 1500 m s⁻¹.

Discuss whether the sound wave can enter the water.

The speed of sound in air is 340 m s⁻¹ and in water it is 1500 m s⁻¹.

Discuss whether the sound wave can enter the water.

Use the graph to show that the nuclear radius of silicon-30 is about 4 fm.

Use the graph to show that the nuclear radius of silicon-30 is about 4 fm.

Use the graph to show that the nuclear radius of silicon-30 is about 4 fm.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

Estimate, using the graph, the radius of a carbon-12 nucleus.

Estimate, using the graph, the radius of a carbon-12 nucleus.

Estimate, using the graph, the radius of a carbon-12 nucleus.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

The distance from S1 to Y is 1.243 m and the distance from S2 to Y is 1.181 m.

Determine the frequency of the microwaves.

Light of wavelength λ is normally incident on a diffraction grating of spacing 3λ. What is the angle between the two second-order maxima?

A.  ${\sin }^{-1}\frac{2}{3}$

B.  ${\sin }^{-1}\frac{4}{3}$

C.  $2{\sin }^{-1}\frac{2}{3}$

D.  >90° so no second orders appear

Light of wavelength λ is normally incident on a diffraction grating of spacing 3λ. What is the angle between the two second-order maxima?

A.  ${\sin }^{-1}\frac{2}{3}$

B.  ${\sin }^{-1}\frac{4}{3}$

C.  $2{\sin }^{-1}\frac{2}{3}$

D.  >90° so no second orders appear

Monochromatic light is used to produce double-slit interference fringes on a screen. The fringe separation on the screen is $y$. The distance from the slits to the screen and the separation of the slits are both doubled, and the light source is unchanged. What is the new fringe separation on the screen?

A. $\frac{y}{4}$

B. $y$

C. $2y$

D. $4y$

Monochromatic light is used to produce double-slit interference fringes on a screen. The fringe separation on the screen is $y$. The distance from the slits to the screen and the separation of the slits are both doubled, and the light source is unchanged. What is the new fringe separation on the screen?

A. $\frac{y}{4}$

B. $y$

C. $2y$

D. $4y$

Wavefronts travel from air to medium Q as shown.

What is the refractive index of Q?

A.  $\frac{\sin 30°}{\sin 45°}$

B.  $\frac{\sin 45°}{\sin 30°}$

C.  $\frac{\sin 45°}{\sin 60°}$

D.  $\frac{\sin 60°}{\sin 45°}$

Wavefronts travel from air to medium Q as shown.

What is the refractive index of Q?

A.  $\frac{\sin 30°}{\sin 45°}$

B.  $\frac{\sin 45°}{\sin 30°}$

C.  $\frac{\sin 45°}{\sin 60°}$

D.  $\frac{\sin 60°}{\sin 45°}$

The diagram shows the diffraction pattern for light passing through a single slit.

What is

                                      $\frac{\text{wavelength of light}}{\text{width of slit}}$

A. 0.01

B. 0.02

C. 1

D. 2

The diagram shows the diffraction pattern for light passing through a single slit.

What is

                                      $\frac{\text{wavelength of light}}{\text{width of slit}}$

A. 0.01

B. 0.02

C. 1

D. 2

Monochromatic light of wavelength $\lambda$ passes through a single-slit of width $b$ and produces a diffraction pattern on a screen. Which combination of changes to $b$ and $\lambda$ will cause the greatest decrease in the width of the central maximum?

Monochromatic light of wavelength $\lambda$ passes through a single-slit of width $b$ and produces a diffraction pattern on a screen. Which combination of changes to $b$ and $\lambda$ will cause the greatest decrease in the width of the central maximum?

Two wave generators, placed at position P and position Q, produce water waves with a wavelength of$4.0 \text{cm}$. Each generator, operating alone, will produce a wave oscillating with an amplitude of $3.0 \text{cm}$ at position R. PR is$42 \text{cm}$ and RQ is $60 \text{cm}$.

Both wave generators now operate together in phase. What is the amplitude of the resulting wave at R?

A.  $9 \text{cm}$

B.  $6 \text{cm}$

C.  $3 \text{cm}$

D.  zero

Two wave generators, placed at position P and position Q, produce water waves with a wavelength of$4.0 \text{cm}$. Each generator, operating alone, will produce a wave oscillating with an amplitude of $3.0 \text{cm}$ at position R. PR is$42 \text{cm}$ and RQ is $60 \text{cm}$.

Both wave generators now operate together in phase. What is the amplitude of the resulting wave at R?

A.  $9 \text{cm}$

B.  $6 \text{cm}$

C.  $3 \text{cm}$

D.  zero

A glass block has a refractive index in air of n_g. The glass block is placed in two different liquids: liquid X with a refractive index of n_X and liquid Y with a refractive index of n_Y.

In liquid X $\frac{n_{\text{g}}}{n_{\text{X}}}=2$ and in liquid Y $\frac{n_{\text{g}}}{n_{\text{Y}}}=1.5.$ What is $\frac{\text{speed of light in liquid X}}{\text{speed of light in liquid Y}}$?

A.  $\frac{2}{4}$

B.  $\frac{3}{4}$

C.  $\frac{4}{3}$

D.  $3$

A glass block has a refractive index in air of n_g. The glass block is placed in two different liquids: liquid X with a refractive index of n_X and liquid Y with a refractive index of n_Y.

In liquid X $\frac{n_{\text{g}}}{n_{\text{X}}}=2$ and in liquid Y $\frac{n_{\text{g}}}{n_{\text{Y}}}=1.5.$ What is $\frac{\text{speed of light in liquid X}}{\text{speed of light in liquid Y}}$?

A.  $\frac{2}{4}$

B.  $\frac{3}{4}$

C.  $\frac{4}{3}$

D.  $3$

The separation of adjacent slits is d. Show that for the second-order diffraction maximum $2\lambda =d\sin \theta$.

The separation of adjacent slits is d. Show that for the second-order diffraction maximum $2\lambda =d\sin \theta$.

The separation of adjacent slits is d. Show that for the second-order diffraction maximum $2\lambda =d\sin \theta$.

Monochromatic light of wavelength 633 nm is normally incident on a diffraction grating. The diffraction maxima incident on a screen are detected and their angle θ to the central beam is determined. The graph shows the variation of sinθ with the order n of the maximum. The central order corresponds to n = 0.

Determine a mean value for the number of slits per millimetre of the grating.

Monochromatic light of wavelength 633 nm is normally incident on a diffraction grating. The diffraction maxima incident on a screen are detected and their angle θ to the central beam is determined. The graph shows the variation of sinθ with the order n of the maximum. The central order corresponds to n = 0.

Determine a mean value for the number of slits per millimetre of the grating.

Monochromatic light of wavelength 633 nm is normally incident on a diffraction grating. The diffraction maxima incident on a screen are detected and their angle θ to the central beam is determined. The graph shows the variation of sinθ with the order n of the maximum. The central order corresponds to n = 0.

Determine a mean value for the number of slits per millimetre of the grating.

Monochromatic light of wavelength $\lambda$ is incident on two slits S₁ and S₂. An interference pattern is observed on the screen.

O is equidistant from S₁ and S₂. A bright fringe is observed at O and a dark fringe at X.

There are two dark fringes between O and X. What is the path difference between the light arriving at X from the two slits?

A.  $\frac{\lambda }{2}$

B.  $\frac{3\lambda }{2}$

C.  $\frac{5\lambda }{2}$

D.  $\frac{7\lambda }{2}$

Monochromatic light of wavelength $\lambda$ is incident on two slits S₁ and S₂. An interference pattern is observed on the screen.

O is equidistant from S₁ and S₂. A bright fringe is observed at O and a dark fringe at X.

There are two dark fringes between O and X. What is the path difference between the light arriving at X from the two slits?

A.  $\frac{\lambda }{2}$

B.  $\frac{3\lambda }{2}$

C.  $\frac{5\lambda }{2}$

D.  $\frac{7\lambda }{2}$

Light of wavelength $\lambda$ is diffracted after passing through a very narrow single slit of width $x$. The intensity of the central maximum of the diffracted light is $I_0$. The slit width is doubled.

What is the intensity of central maximum and the angular position of the first minimum?

Light of wavelength $\lambda$ is diffracted after passing through a very narrow single slit of width $x$. The intensity of the central maximum of the diffracted light is $I_0$. The slit width is doubled.

What is the intensity of central maximum and the angular position of the first minimum?

In two different experiments, white light is passed through a single slit and then is either refracted through a prism or diffracted with a diffraction grating. The prism produces a band of colours from M to N. The diffraction grating produces a first order spectrum P to Q.

What are the colours observed at M and P?

In two different experiments, white light is passed through a single slit and then is either refracted through a prism or diffracted with a diffraction grating. The prism produces a band of colours from M to N. The diffraction grating produces a first order spectrum P to Q.

What are the colours observed at M and P?

A ray of light is incident on the flat side of a semi-circular glass block placed in paraffin. The ray is totally internally reflected inside the glass block as shown.

The refractive index of glass is $n_1$ and the refractive index of paraffin is $n_2$.

What is correct?

A.  $\sin \theta =\frac{n_1}{n_2}$

B.  $\sin \theta =\frac{n_2}{n_1}$

C.  $\sin \theta =\frac{1}{n_1}$

D.  $\sin \theta =\frac{1}{n_2}$

A ray of light is incident on the flat side of a semi-circular glass block placed in paraffin. The ray is totally internally reflected inside the glass block as shown.

The refractive index of glass is $n_1$ and the refractive index of paraffin is $n_2$.

What is correct?

A.  $\sin \theta =\frac{n_1}{n_2}$

B.  $\sin \theta =\frac{n_2}{n_1}$

C.  $\sin \theta =\frac{1}{n_1}$

D.  $\sin \theta =\frac{1}{n_2}$

The refractive index of glass is $\frac{3}{2}$ and the refractive index of water is $\frac{4}{3}$. What is the critical angle for light travelling from glass to water?

A.  ${\sin }^{-1}\left(\frac{1}{2}\right)$

B.  ${\sin }^{-1}\left(\frac{2}{3}\right)$

C.  ${\sin }^{-1}\left(\frac{3}{4}\right)$

D.  ${\sin }^{-1}\left(\frac{8}{9}\right)$

The refractive index of glass is $\frac{3}{2}$ and the refractive index of water is $\frac{4}{3}$. What is the critical angle for light travelling from glass to water?

A.  ${\sin }^{-1}\left(\frac{1}{2}\right)$

B.  ${\sin }^{-1}\left(\frac{2}{3}\right)$

C.  ${\sin }^{-1}\left(\frac{3}{4}\right)$

D.  ${\sin }^{-1}\left(\frac{8}{9}\right)$

Explain why the received intensity varies between maximum and minimum values.

Explain why the received intensity varies between maximum and minimum values.

Explain why the received intensity varies between maximum and minimum values.

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

Explain why the received intensity varies between maximum and minimum values.

Explain why the received intensity varies between maximum and minimum values.

Explain why the received intensity varies between maximum and minimum values.

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

B is placed at the first minimum. The frequency is then changed until the received intensity is again at a maximum.

Show that the lowest frequency at which the intensity maximum can occur is about 3 kHz.

Speed of sound = 340 m s⁻¹

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

A group of students perform an experiment to find the refractive index of a glass block. They measure various values of the angle of incidence i and angle of refraction r for a ray entering the glass from air. They plot a graph of the sin r against sin i.

They determine the gradient of the graph to be m.

Which of the following gives the critical angle of the glass?

A.  sin⁻¹(m)

B.  sin⁻¹$\left(\frac{1}{m}\right)$

C.  m

D.  $\frac{1}{m}$

Two identical sources oscillate in phase and produce constructive interference at a point P. The intensity recorded at P is I.

What is the intensity at P from one source?

A.  $\sqrt{2}$I
B.  I

C.  $\frac{I}{2}$

D.  $\frac{I}{4}$

Two identical sources oscillate in phase and produce constructive interference at a point P. The intensity recorded at P is I.

What is the intensity at P from one source?

A.  $\sqrt{2}$I
B.  I

C.  $\frac{I}{2}$

D.  $\frac{I}{4}$

Two identical sources oscillate in phase and produce constructive interference at a point P. The intensity recorded at P is I.

What is the intensity at P from one source?

A.  $\sqrt{2}$I
B.  I

C.  $\frac{I}{2}$

D.  $\frac{I}{4}$

Two identical sources oscillate in phase and produce constructive interference at a point P. The intensity recorded at P is I.

What is the intensity at P from one source?

A.  $\sqrt{2}$I
B.  I

C.  $\frac{I}{2}$

D.  $\frac{I}{4}$

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

Explain why the intensity of light at $x$ = 0 is 4 $I_0$.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

The two slits are replaced by many slits of the same separation. State one feature of the intensity pattern that will remain the same and one that will change.

Stays the same:

Changes:

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. $x$ represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_0$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Explain the pattern seen on the screen.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

Calculate, in nm, $\lambda$.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.

The student changes the light source to one that emits two colours:
• blue light of wavelength $\lambda$, and
• red light of wavelength 1.5$\lambda$.

Predict the pattern that the student will see on the screen.