A-LevelPhysicsWaves9702/12 · May/June 2010 · Q231 Mark
Diagram 1 shows a ripple tank experiment in which plane waves are diffracted through a narrow slit in a metal sheet. Diagram 2 shows the same tank with a slit of greater width. In each case, the pattern of the waves incident on the slit and the emergent pattern are shown. [Figure 23.1] Which action would cause the waves in diagram 1 to be diffracted less and so produce an emergent pattern closer to that shown in diagram 2?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aincreasing the frequency of vibration of the bar
Bincreasing the speed of the waves by making the water in the tank deeper
Creducing the amplitude of vibration of the bar
Dreducing the length of the vibrating bar
✓ Correct answer
A: increasing the frequency of vibration of the bar
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