1 What is the source of all waves? 2 A water wave vibrates up and down four time

Question

1 What is the source of all waves?

2 A water wave vibrates up and down four times each second, the distance between two successive crests is 5 meters, and the height from the lowest part to the highest part of the wave is 2 meters.

a What is the frequency of the wave in hertz?

b What is the period of the wave in seconds?

c What is the speed of the wave in meters per seconds?

d What is the amplitude of the wave in meters?

3 When you sit in the stands at a baseball stadium, you will hear the crack of the bat a short time after you see the batter hit the ball. Explain.

4 Why is the moon sometimes described as silent?

Explanation / Answer

1) Disturbance of molecules

2) a) frequency f = 1/0.5 = 2 hz

b) time, t = 1/2 = 0.5 sec

c) speed, v = 5 x 2 = 10 m/s

d) amplitude, a = 1 m

3) Because the velocity of light is faster than velocity of sound.

4)  The Moon has no atmosphere, and sound can't carry in a vacuum.

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