A-LevelPhysicsWaves9702/12 · May/June 2023 · Q271 Mark
A continuous progressive water wave in a ripple tank passes through a gap in a barrier and diffracts. The width of the gap is greater than the wavelength of the wave. Which change causes the wave to spread over a larger angle as it passes through the gap?
Asmall decrease in the wavelength of the wave
Bsmall decrease in the width of the gap
Csmall increase in the frequency of the wave
Dsmall increase in the height of the barrier
✓ Correct answer
B: small decrease in the width of the gap
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