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Question 18M.1.HL.TZ1.28

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.HL.TZ1.28
Level HL Paper 1 Time zone TZ1
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
18M.1.HL.TZ1.28

Monochromatic light is incident on 4 rectangular, parallel slits. The first principal maximum is observed at an angle θ to the direction of the incident light. The number of slits is increased to 8 each having the same width and spacing as the first 4.

Three statements about the first principal maximum with 8 slits are

     I.     the angle at which it is observed is greater than θ

     II.     its intensity increases

     III.     its width decreases.

Which statements are correct?

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III 

[1]

Markscheme

C

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