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Question 17N.2.HL.TZ0.a.i

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.2.HL.TZ0.a.i
Level HL Paper 2 Time zone TZ0
Command term Explain Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
17N.2.HL.TZ0.a.i

Yellow light from a sodium lamp of wavelength 590 nm is incident at normal incidence on a double slit. The resulting interference pattern is observed on a screen. The intensity of the pattern on the screen is shown.

Explain why zero intensity is observed at position A.

[2]

Markscheme

the diagram shows the combined effect of «single slit» diffraction and «double slit» interference

recognition that there is a minimum of the single slit pattern

OR

a missing maximum of the double slit pattern at A

waves «from the single slit» are in antiphase/cancel/have a path difference of (n + 1 2 )λ/destructive interference at A

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