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

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

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.

The distance from the centre of the pattern to A is 4.1 x 10–2 m. The distance from the screen to the slits is 7.0 m.

Calculate the width of each slit.

[2]

Markscheme

θ = 4.1 × 10 − 2 7.0  OR b =  λ θ «= 7.0 × 5.9 × 10 − 7 4.1 × 10 − 2 »

1.0 × 10–4 «m»

Award [0] for use of double slit formula (which gives the correct answer so do not award BCA)

Allow use of sin or tan for small angles

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