Questions
A siren emitting a sound of frequency 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? (The Velocity of Sound in air
detailed solution
Correct option is A
Here, frequency of sound emitted by siren, v0=800 Hz Speed of source, vs=15 m s-1 Speed of sound in air, v=330 m s-1Apparent frequency of sound at the cliff = frequency heard by observer=v Using Doppler's effect of sound v=vv-vsv0=330330-15×800=330315×800=838.09 Hz≈838 HzSimilar Questions
A person going away from a gate keeper on a scooter at a speed of 10 m/s blows a horn of frequency 600 Hz. If speed of sound is 340 m/s find the apparent frequency heard by the gatekeeper.
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