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Q.

An ambulance blowing the siren of frequency 700 Hz is travelling slowly towards vertical reflecting wall with a speed of 2 m/s. The speed of sound is 350 m/s, The number of beats are heard per sec to the driver of the ambulance is ____ Hz. (Round off to nearest integer)

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answer is 8.

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Detailed Solution

$Δ f_{b} = {f^{'}}_{s} - f_{s}$

$Δ f_{b} = 700 (\frac{350 + 2}{350 - 2}) - 700$

$Δ f_{b} = 8 H z$

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