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Question

The frequencies of three tuning forks A, B and C have a relation nA>nB>nc. When the forks A and B are sounded together the number of beats produced is n1. When A and C are sounded together the number of beats produced is n2, then the number of beats produced when B and C are sounded together is

A
nJ+n2
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B
n1+n22
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C
n2n1
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D
n1n2
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Solution

The correct option is B n2n1
No. of beats produced, n=n1n2
When A and B are sounded, n1=nAnB
When A and C are sounded, n2=nAnC
When B and C are sounded:
n=nBnC
=(nAnC)(nAnB)
=n2n1

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