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Questions  

Two adjacent piano keys are struck simultaneously. The notes emitted by them have frequencies n1 and n2. The number of beats heard per second is

a
12(n1−n2)
b
12(n1+n2)
c
n1~n2
d
2 (n1−n2)

detailed solution

Correct option is C

Beat frequency nb=n1~n2

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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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