A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5×10−2 kg and its linear density is 4.0×10−2 kg m−1. The tension in the string is approximately -
A
300.47N
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B
425.25 N
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C
247.27 N
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D
500 N
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Solution
The correct option is C247.27 N Mass of wire (m)=3.5×10−2 kg
Linear density (μ)=4×10−2 kg/m μ=mL ⇒L=mμ=3.5×10−24×10−2=78m
In fundamental mode , L=λ2 ∴λ=2L=74m
Now velocity of transverse wave is, v=fλ=45×74=78.75m/s
Using ⇒v=√Tμ ⇒T=μv2 ∴T=4×10−2×(78.75)2=248 N