DP Physics (last assessment 2024)

Question 18M.2.HL.TZ2.5b

Date	May 2018	Marks available	[Maximum mark: 3]	Reference code	18M.2.HL.TZ2.5b
Level	HL	Paper	2	Time zone	TZ2
Command term	Sketch	Question number	b	Adapted from	N/A

[Maximum mark: 3]

18M.2.HL.TZ2.5b

(b)

Monochromatic light from a single source is incident on two thin, parallel slits.

M18/4/PHYSI/HP2/ENG/TZ2/05.b_01

The following data are available.

$\begin{array}{*{20}{l}} {{\text{Slit separation}}}&{ = 0.12{\text{ mm}}} \\ {{\text{Wavelength}}}&{ = 680{\text{ nm}}} \\ {{\text{Distance to screen}}}&{ = 3.5{\text{ m}}} \end{array}$

The intensity I of light at the screen from each slit separately is I₀. Sketch, on the axes, a graph to show the variation with distance x on the screen of the intensity of light on the screen for this arrangement.

[3]

Markscheme

«standard two slit pattern»

general shape with a maximum at x = 0

maxima at 4I₀

maxima separated by « $\frac{{D\lambda }}{s}$ =» 2.0 cm

Accept single slit modulated pattern provided central maximum is at 4. ie height of peaks decrease as they go away from central maximum. Peaks must be of the same width

[3 marks]

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 9: Wave phenomena » 9.3 – Interference

Additional higher level (AHL) » Topic 9: Wave phenomena

Question 18M.2.HL.TZ2.5b

Select a Test

Syllabus sections

Confirm action