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Questions  

Two sound sources produce progressive waves given by y1=12cos100πt and y2=12cos102πt near the ear of an observer. When sounded together, the observer will hear beats. The observed beat frequency (in Hz) is

a
1 Hz
b
2 Hz
c
3 Hz
d
4 Hz

detailed solution

Correct option is A

Frequency of two sourcef1=50Hz, f2=51Hzso beat frequency =1/sec=1Hz

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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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