A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of15 
. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air 
)
Text Solution
Verified by ExpertsThe correct answer is:
A
Here, frequency of sound emitted by siren, 
Speed of source, 
Speed of sound in air, 
Apparent frequency of sound at the cliff 
frequency heard by observer 
Using Doppler’s effect of sound
Hz 
Hz
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