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The driver of a car travelling with speed 30 m/sec towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by driver is

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555.5 Hz

720 Hz

500 Hz

550 Hz

answer is B.

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Detailed Solution

$n^{'} = n_{o} [\frac{v + v_{o}}{v - v_{s}}] = 600 [\frac{330 + 30}{330 - 30}]$

$= 2 \times 360 = 720 Hz$

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