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Q.

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

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a

720 Hz

b

555.5 Hz

c

550 Hz

d

500 Hz

answer is A.

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Detailed Solution

From the figure, it is clear that Frequency of reflected sound heard by the driver.n'=n v−(−vo)v−vs=n v+vov−vs=n v+vcarv−vcar=600 330+30330−30=720 Hz.

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