Question

A vibrating body produces 20 crest and 20 trough in 0.2 sec , what is frequency and the time period?

Answer 1

Solution :

Since the sound wave produces 20 crests in 0.2 second, the density of the medium at a place becomes maximum 20 times in 0.2 second. The number of times it becomes maximum in 1 second is

So, the frequency is 100 times /second or 100 Hz.

Answer 2

5is the frequency

Frequency =1/time