The distribution of the sound intensity of the whistle as observed by the passengers in train A is best represented by [2007]

Question

Two trains A and B 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 $f_{1}$ = 800 Hz to $f_{2}$ = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency − lowest frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s. [2007]

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

Smart Achievers · Accepted Answer

(1)

There is no relative motion between the source and the observer for the passengers in train A. Since all the passengers in train A are moving with a velocity of 20 m/s, therefore the distribution of sound intensity of the whistle by the passengers in train A is uniform.

Solution

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Ans.
(1)

There is no relative motion between the source and the observer for the passengers in train A. Since all the passengers in train A are moving with a velocity of 20 m/s, therefore the distribution of sound intensity of the whistle by the passengers in train A is uniform.

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Solution

1

2

3

4

Ans. (1) There is no relative motion between the source and the observer for the passengers in train A. Since all the passengers in train A are moving with a velocity of 20 m/s, therefore the distribution of sound intensity of the whistle by the passengers in train A is uniform.

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Ans.
(1)

There is no relative motion between the source and the observer for the passengers in train A. Since all the passengers in train A are moving with a velocity of 20 m/s, therefore the distribution of sound intensity of the whistle by the passengers in train A is uniform.