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Newton's Contention

Two cars A an...

Question

Two cars A and B depart simultaneously from the same position and in same direction on a straight road. A starts with constant velocity $22 m / s$ , while B starts with constant velocity of $42 m / s$ . The driver of car A hears a sound of frequency $352 Hz$ emitted by car B after 10 s of start. Find the actual frequency of the sound as emitted by B. (given velocity of sound = 330 m/s)

A

525 Hz

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B

280 Hz

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C

372 Hz

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D

450 Hz

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Solution

The correct option is C $372 Hz$
$f_{a p p} = \frac{(330 + 22)}{(330 + 42)} f_{0}$
$f_{0} = \frac{372 \times 352}{352} = 372 Hz$

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