
Obtain a pan of water and form a barrier in it that has a wide slit as shown. Place a dowel in the water and gently rock it back and forth to generate straight wavefronts at a constant rate.
Gradually decrease the width of the slit until it is completely closed. Observe the wavefronts in Region II as you makethis change.
1. Describe how the shape of the wavefronts in Region II is affected as the width of the slit is decreased.
2. Compare the spacing of the wavefronts in the two regions (I and II). Is the spacing of the wavefronts in Region II affected by changing the width of the slit?
Explain how your observation of the spacing of the waefronts is consistent with the relative wave speeds in the two regions.
3. How, if at all, does the amplitude of the wave in Region II change when the slit is made slightly narrower? In particular, consider two cases in which:
•the slit is initially very wide and is made slightly narrower.
•the slit is initially very narrow and is made even narrower.

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