Question

A source of sound produces 20 compressions and 20 rarefactions in 0.4 second find the frequency and will you be able to hear the sound or not

Answer 1

Explanation:

Frequency = Wavelength / Time

1 Wavelength = 1 Compression + 1 Rarefaction

The sound produces 20 wavelengths in 0.4 seconds,

So, Frequency = 20 / 0.4 = 50 Hz

We will be able to hear the sound because it is more than 20Hz.

Answer 2

As we know that f=w/t

1 w=1 compression + 1 rarefaction

According to the problem ,

The sound produces 20 w in 0.4 sec ,

f = 20/0.4 = 200/4 = 50 Hz

We can be able to hear the sound because it is of 50 Hz which is more than 20 Hz .

( f = frequency , w = wavelength , t = time)

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