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(B) Let the frequency of both sirens be $f$ and the speed of sound be $v$. Let the observer move with velocity $v_0$ towards one siren and away from t

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Listens to beats

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(B) Let the frequency of both sirens be $f$ and the speed of sound be $v$. Let the observer move with velocity $v_0$ towards one siren and away from the other.For the siren the observer is moving towards,the apparent frequency is $f_1 = f \left( \frac{v + v_0}{v} ight)$.For the siren the observer is moving away from,the apparent frequency is $f_2 = f \left( \frac{v - v_0}{v} ight)$.Since the observer hears two sound waves of slightly different frequencies $(f_1 
eq f_2)$ simultaneously,the superposition of these waves results in the phenomenon of beats.The beat frequency is given by $|f_1 - f_2| = \frac{2 f v_0}{v}$.Therefore,the observer will listen to beats.Option $(B)$ is the correct answer.

An observer while going on a scooter hears the sound of two sirens of the same frequency from two opposite directions. If he travels along the direction of one of the sirens,then he:

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