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

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Listens resonance

Listens beats

Will not listen sound due to destructive interference

Will listen intensive sound due to constructive interference

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detailed solution

Correct option is B

Because of Doppler effect the apparent frequencies reaching the person are different, hence he can observe beats.

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A metal wire of diameter 1.5 mm is held on two knife edges separated by a distance 50 cm the tension in the wire is 100 N the wire vibrating with its fundamental frequency and vibrating tuning fork together produces 5 beats per second. The tension in the wire is then reduced to 81 N, when the two are excited, beats are heard at the same rate. Calculate frequency of the fork.

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