Q. 77 C4.6( 36 Votes )

A pendulum oscillates 40 times in 4 seconds. Calculate its

(i) time-period, and

(ii) frequency.

Can we hear the sound produced by the oscillations of this pendulum? Give reason for your answer.

Answer :

Frequency = 40 vibration/ 4 seconds = 10 Hz

Thus, time period = 1/f = 1/10 = 0.1 seconds.

No, we cannot hear because the audible human range is from 20Hz to 20,000 Hz.

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