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Question 18M.2.HL.TZ1.b.i

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

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

The graph of variation of intensity with diffraction angle for this experiment is shown.

M18/4/PHYSI/HP2/ENG/TZ1/03.b

Calculate the angular separation between the central peak and the missing peak in the double-slit interference intensity pattern. State your answer to an appropriate number of significant figures.

[3]

Markscheme

sin θ =  4 × 633.0 × 10 − 9 0.300 × 10 − 3

sin θ = 0.0084401…

final answer to three sig figs (eg 0.00844 or 8.44 × 10–3)

 

Allow ECF from (a)(iii).

Award [1] for 0.121 rad (can award MP3 in addition for proper sig fig)

Accept calculation in degrees leading to 0.481 degrees.

Award MP3 for any answer expressed to 3sf.

[3 marks]

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