First slide

Doppler

Question

A table is rotating about its axis at the rate of 5 rotations per second. A source of sound of frequency 10³ Hz is fixed at a distance 0 . 7 m from its axis. If the velocity of sound is 352 m/s, then the difference of apparent frequencies heard by an observer standing in
front of the table, will be

Moderate

A

120 Hz
B

125Hz
C

250Hz
D

500Hz

Solution

$We know that Δn = \frac{2 nωr}{V} ∴ Δn = \frac{2 \times 10^{3} \times (2 \times 3 \cdot 14 \times 5) \times 0 \cdot 7}{352} = 125 Hz$

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