Inquiry

There is an advantage and a disadvantage in using two masses that are almost equal.

State and explain the disadvantage with reference to your answer to (a)(ii).

State why the experiment is repeated with different values of $W$.

The measurements of $T$ were collected five times. Explain how repeated measurements of $T$ reduced the random error in the final experimental value of $mr$.

Outline why repeated measurements of $T$ would not reduce any systematic error in $T$.

The mixture was held in a large metal container during the mixing.

Explain one change to the procedure that will reduce the difference in (b)(i).

There is an advantage and a disadvantage in using two masses that are almost equal.

State and explain the disadvantage with reference to your answer to (a)(ii).

State why the experiment is repeated with different values of $W$.

The measurements of $T$ were collected five times. Explain how repeated measurements of $T$ reduced the random error in the final experimental value of $mr$.

Outline why repeated measurements of $T$ would not reduce any systematic error in $T$.

The mixture was held in a large metal container during the mixing.

Explain one change to the procedure that will reduce the difference in (b)(i).

The mixture was held in a large metal container during the mixing.

Explain one change to the procedure that will reduce the difference in (b)(i).

Predict from the equation whether the value of $mr$ found experimentally will be larger, the same or smaller than the value of $mr$ calculated directly.

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.  $\frac{1}{m}$

Predict from the equation whether the value of $mr$ found experimentally will be larger, the same or smaller than the value of $mr$ calculated directly.

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 different experiments, P and Q, generate two sets of data to confirm the proportionality of variables $x$ and $y$. The graphs for the data from P and Q are shown. The maximum and minimum gradient lines are shown for both sets of data.

What is true about the systematic error and the uncertainty of the gradient when P is compared to Q?

Two different experiments, P and Q, generate two sets of data to confirm the proportionality of variables $x$ and $y$. The graphs for the data from P and Q are shown. The maximum and minimum gradient lines are shown for both sets of data.

What is true about the systematic error and the uncertainty of the gradient when P is compared to Q?