A sound-wave source produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.

A sound-wave source produces 40 crests and 40 troughs in 0.4 second. F

1.	A sound-wave source produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.
A.	40 hz
B.	400 hz
C.	100 hz
D.	10.4 hz
Answer» D. 10.4 hz

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A sound-wave source produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.

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