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Two trains A and B are moving with speed...

Two trains A and B are moving with speeds 20 m/s and 30 m/s, respectively in the same direction on the same straight track with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from `f_(1)=800Hz` to `f_(2)=1120Hz`, as shown in the figure. the spread in the frequency (highest frequency-lowest frequency) is thus 320Hz. the speed of sound in still air is 340 m/s.

Q. The distribution of the sound intensity of the whistle as observed by the passengers in train A is best represented by :

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A
Because
`V_(S) = V_(O) = 20`
so as seen form passengers of train `A`,
`f' = f_(0)`
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