First slide

Doppler

Question

A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is flxed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = 352 m/s)

Moderate

A

1000 Hz
B

1066 Hz
C

941 Hz
D

352 Hz

Solution

For source $v_{S} = r ω = 0.70 \times 2 π \times 5 = 22 m / \sec$
Minimum frequency is heard when the source is receding the man. It is given by $n_{\min} = n \frac{v}{v + v_{s}}$
$1000 \times \frac{352}{352 + 22} = 941 Hz$

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