MHT CET 2024 Physics question

With what velocity an observer should move relative to a stationary source so that a sound of triple the frequency of source is heard by an observer?

(A)Same as velocity of sound towards the source
(B)Same as velocity of sound away from the source
(C)Half the velocity of sound towards the source
(D)Twice the velocity of sound towards the sourceCorrect

Answer: (D)

Solution

For a stationary source and a moving observer, the apparent frequency is when the observer moves towards the source and when moving away. We need , so ,

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Question ID VK-096791