Question

1. What is the frequency of a sound wave whose time-period is 0.05 s?
Sol.-> Time period = 0.05 second
f = 1/T
f = (1 ÷ 0.05) Hz
f = (100 ÷ 5) Hz
f = 20 Hz
2. What is the frequency of a sound wave whose time-period is 0.02s?

3. If 25 sound waves are produced per second, what is the frequency in hertz?
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Answer 1

1.. The wave frequency is 20 H

2..The frequency of sound emitted by source is 620 Hz. The frequency of sound heard by observer at t=3 seconds is (if source starts emitting sound at t=0). (Assume velocity sound=330 m/s).

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