A-LevelPhysicsWaves9702/12 · May/June 2022 · Q281 Mark

A bar vibrates with frequency f to produce water waves in a ripple tank. [Figure 28.1] The waves pass through a gap of width x in a barrier so that diffraction occurs. Which combination of vibration frequency and gap width will produce the smallest angle of diffraction?

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Avibration frequency: f/2, gap width: x/2

Bvibration frequency: f/2, gap width: 2x

Cvibration frequency: 2f, gap width: x/2

Dvibration frequency: 2f, gap width: 2x

✓ Correct answer

D: vibration frequency: 2f, gap width: 2x

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