MHT CET Physics question
A source of sound with frequency 256 Hz is moving with a velocity v towards a wall. When the observer is between source and the wall, he finds that the frequency of two waves received directly from the source is x and the frequency of the waves received after reflection from the wall is y, then
Answer: (C)
Solution
The observer is at rest and the source approaches him, so ; the reflected wave carries the frequency received by the wall, , and
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