NEET 2016 Physics question
A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of . Then, the frequency of sound that the observer hears in the echo reflected from the cliff is : (Take velocity of sound in air = )
Answer: (3)
Solution
The siren moves towards the cliff, so the (stationary) cliff acts as an observer receiving sound from an approaching source: . The cliff re-emits (reflects) this frequency
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