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Q.

If n1, n2 and n3 be the frequencies of the segments of stretched string, find out the frequency n of the string itself in terms of n1, n2 and n3

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a

n1n2n3n1+n2+n3

b

n1n2+n2n3+n3n1n1n2n3

c

n1n2n3n1n2+n2n3+n3n1

d

n1n2n3n1n1+n2n2+n3n3

answer is C.

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Detailed Solution

l∝1n; For l=l1+l2+l3

1n=1n1+1n2+1n3⇒n=n1n2n3n1n2+n2n3+n3n1

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