Physics - Sound Wave Question with Solution | TestHub
Paragraph:Two trains and are moving with speeds and , respectively in the same direction on the same straight track, with ahead of . The engines are at the front ends. The engine of train blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from to , as shown in the figure. The spread in the frequency (highest frequency - lowest frequency) is thus . The speed of sound in still air is .Question:The distribution of the sound intensity of the whistle as observed by the passengers in train is best represented by
Options:
Answer:
Solution:
For the passengers in train , there is no relative motion between source and observe, as both are moving with velocity . Therefore, there is no change in observed frequencies and correspondingly there is no change in their intensities. Therefore, the correct option is (a).