Question

A source of wave produces 20 crests and 20 troughs in 0.4 s. Find the frequency. *

Answer 1

Answer:

frequency = 20/0.4 ans is 50

Explanation:

hope it helps

Answer 2

Answer:

Given

The time in which 20 crests is produced=0.4sec

The time in which 20 troughs is produced=0.4sec

Now,

The time in which 1 crest will produced(t)= 0.4/20

=0.02sec

The time in which 1trough will produced(t)= 0.4/20

=0.02sec

And,

Frequency=1/t

=1/0.02 Hz

=1x100/2 Hz

=100/2 Hz

=50 Hz

Explanation:

I hope that it would help you.