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Question 21M.2.HL.TZ2.8a.iii

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.HL.TZ2.8a.iii
Level HL Paper 2 Time zone TZ2
Command term Show that Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 1]
21M.2.HL.TZ2.8a.iii

Monochromatic light of wavelength λ is normally incident on a diffraction grating. The diagram shows adjacent slits of the diffraction grating labelled V, W and X. Light waves are diffracted through an angle θ to form a second-order diffraction maximum. Points Z and Y are labelled.

  

(a.iii)

The separation of adjacent slits is d. Show that for the second-order diffraction maximum 2λ=dsin θ.

[1]

Markscheme

sin θ«=XZVX»=4λ2d✓


Do not award ECF from(a)(ii).

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