The period of a mechanical wave is 5 seconds. what is the frequency of the wave?

10 hz
2.5 hz
0.2 hz
depends on the speed of the wave
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The frequency of a wave is just the reciprocal of the period.For this one . . .
Frequency  =  1/(period)  =  1/(5 sec)  =  0.2 per sec (0.2 Hz) .

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