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Q.

Two similar sonometer wires given fundamental frequencies of 500Hz. These have same tensions. By what amount the tension be increased in one wire so that the two wires produce 5 beats/sec

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a

1%

b

2%

c

3%

d

4%

answer is B.

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Detailed Solution

To produce 5 beats/sec. Frequency of one wire should be increase up to 505 Hz. i.e. increment of 1% in basic frequency.n∝T  or  T∝n2 ⇒ΔTT=2Δnn⇒ percentage change in Tension = 2 (1%)=2%
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