Water waves can be created easily by moving your hand in a bathtub or other small pool

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Water waves can be created easily by moving your hand in a bathtub or other small pool of water. The wave crests can be directly observed.
a. Try moving your hand at different frequencies. How does the wavelength vary with frequency?
b. Can you estimate the speed of a wave pulse?
c. By using both hands, two waves can be created that come together and interfere. If you move your hands in unison, you should observe constructive interference along the center line between the two waves. What effect does this have on the wave that you observe along the center line?
d. Can you produce destructive interference by moving your hands so that one is going up while the other is going down? Describe what happens when you attempt this.

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