MHT CET 2024 Physics question
The pitch of a whistle of an engine appears to drop by 30% of original value when it passes a stationary observer. If the speed of sound in air is , then the speed of engine in is
Answer: (D)
Solution
Let be the actual frequency of the whistle, the speed of sound and the speed of the engine. After the engine has passed, it is receding from the stationary observer and the apparent frequency is . The pitch has dropped by 30% of the original value, so $f' =
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