15.14 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 mass density is 4.0 × 10–2 kg m–1. What is (a) the speed of a transverse wave on the string (b) the tension in the string?

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    Vishal Baghel | Contributor-Level 10

    5 months ago

    Mass of the wire, m = 3.5 ×10-2 kg

    Linear mass density,  μ=ml = 4 ×10-2 kg/m

    Frequency of vibration,  ν = 45 Hz

    Length of the wire, l = mμ = 3.5×10-24×10-2 = 0.875 m

    The wavelength of the stationary wave λ = 2ln , where n = number of nodes in the wire

    For fundamental node, n = 1,  λ = 2l = 2 ×0.875=1.75m

    (a) The speed of the transverse wave in the string is given as v = νλ = 45 ×1.75 = 78.75 m/s

     

    (b) The tension produced in the string is given by the relation, T = v2μ =  (78.75)2 × 4 ×10-2 = 248.06 N

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