First slide

Doppler

Question

A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed 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/sec)

Moderate

Solution

For source $v_{s} = r ω = 0.7 \times 2 π \times 5 = 22 m / \sec$
Min frequency is heard when the source is receding the man. It is given by
$\begin{array}{l} n_{\min} = n . \frac{v}{v + v_{s}} \\ \Rightarrow n_{\min} = 1000 \times \frac{352}{352 + 22} = 941 H z \end{array}$

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