First slide

Doppler's effect

Question

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency

Moderate

A

5%
B

20%
C

Zero
D

0.5%

Solution

When observer moves towards stationary source then apparent frequency
$n' = [\frac{v + v_{O}}{v}] n = [\frac{v + v / 5}{v}] n = \frac{6}{5} n = 1 .2 n$
Increment in frequency = 0.2 n so percentage change in frequency = $\frac{0 .2 n}{n} \times 100$ = 20%.

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