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

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500 Hz

555.5 Hz

550 Hz

720 Hz

answer is A.

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Detailed Solution

This question is the same as that of the previous one so

$n^{'} = (\frac{V + V_{c a r}}{V - V_{c a r}}) n = 720 H z$

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