Question

A source of wave produces 40 crests and 40 troughs in 0.4 s. What is the frequency of the wave?

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Answer

One crest and one trough make one wave, hence there are 40 waves.

time (t) = 0.4 s

frequency f = ?

Frequency is the number of waves per second,

f = 40\over 0.4 = 100 Hz

Hence,

Frequency of the wave = 100 Hz

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