First slide

Travelling wave

Question

The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be

Moderate

A

70 decibel
B

72.9 decibel
C

81 decibel
D

60 decibel

Solution

After passing the 3 meter intensity is given by
$I_{3} = \frac{90}{100} \times \frac{90}{100} \times \frac{90}{100} \times I = 72 .9 % of I$
So, the intensity is 72.9 decibel.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App