Two factories are sounding their sirens at 800 Hz . A man goes from one factory to other at a speed of 2 ~m / s . The velocity of sound is 320 ~m / s . The number of beats heard by the person in one second will be:

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Quantrex Academy · Accepted Answer

Correct answer: D. 10

Given: Frequency of sound produced by siren, f=800 Hz Speed of observer, u=2 m / s Velocity of sound, v=320 m / s No. of beats heard per second = ? No. of extra waves received by the observer per second =± 4 λ No. of beats/ sec aligned &=(2)/(λ)-(-(2)/(λ))=(4)/(λ) &=(2 × 2)/((320)/(800)) ( \ lambda=(V)/(f)) &=(2 × 2 × 800)/(320)=10 aligned

Two factories are sounding their sirens at 800 Hz . A man goes from...

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