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Question 22N.2.HL.TZ0.7a.iii

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.HL.TZ0.7a.iii
Level HL Paper 2 Time zone TZ0
Command term Calculate Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 2]
22N.2.HL.TZ0.7a.iii

A beam of coherent monochromatic light is incident normally on a single rectangular slit. The diffraction pattern is observed on a screen.

O is the point on the screen directly opposite the slit. P and Q are the first minima on either side of the central fringe of the diffraction pattern.

(a.iii)

The following data are available.

                                  Wavelength of light = 590 nm

Distance between the slit and the screen = 2.4 m

                                        Width of the slit = 0.10 mm

Calculate distance PQ.

[2]

Markscheme

angle of the first minimum =590×10-90.10×10-3=«0.0059 rad» ✓

width =2×0.0059×2.4=2.8×10-2 «m» ✓

 

1.4 × 10−2 m scores [1] mark.

Do not penalize the use of sin or tan in MP2.

Examiners report

Well answered.

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