Sound WavesHard

Question

A copper wire is fixed between two rigid supports. It is stretched with negligible tension at 30oC. The speed of transverse waves in the wire at 10oC will be - (density d = 9 × 103 kg/ m3, Young′s modulus Y = 1.3 × 1011 N/m2 and temperature coefficient of expansion a = 1.7 × 10-5 /oC) : -

Options

A.210 m / s
B.110 m/s
C.90 m/s   
D.70 m/s

Solution

ᐃL = αθAy
μ = dA ∴ v = = 70m/s

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