First slide

Doppler's effect

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 nearly (speed of sound = 352 m/s)

Moderate

A

1000 Hz
B

1066 Hz
C

941 Hz
D

352 Hz

Solution

For source $v_{s} = rω = 0 .70 \times 2 π \times 5 = 22 m / \sec$
Minimum frequency is heard when the source is receding the man. It is given by $n_{\min} = n \frac{v}{v + v_{s}}$
$= 1000 \times \frac{352}{352 + 22} = 941 Hz$

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