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Question 18M.2.SL.TZ1.3a.ii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.SL.TZ1.3a.ii
Level SL Paper 2 Time zone TZ1
Command term Calculate Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 2]
18M.2.SL.TZ1.3a.ii

A beam of coherent monochromatic light from a distant galaxy is used in an optics experiment on Earth.

The beam is incident normally on a double slit. The distance between the slits is 0.300 mm. A screen is at a distance D from the slits. The diffraction angle θ is labelled.

M18/4/PHYSI/SP2/ENG/TZ1/03.a

(a.ii)

The wavelength of the beam as observed on Earth is 633.0 nm. The separation between a dark and a bright fringe on the screen is 4.50 mm. Calculate D.

[2]

Markscheme

evidence of solving for D «D = s d λ »

« 4.50 × 10 − 3 × 0.300 × 10 − 3 633.0 × 10 − 9 × 2» = 4.27 «m»

 

Award [1] max for 2.13 m.

[2 marks]

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