A string of mass per unit length μ is clamped at both ends such that one end of the string is at x = 0 and the other is at x = L . When the string vibrates in fundamental mode, the amplitude of the mid-point O of the string is a , and tension in the string is T , Find the total oscillation energy stored in the string.

Question

A string of mass per unit length μ is clamped at both ends such that one end of the string is at x = 0 and the other is at x = L . When the string vibrates in fundamental mode, the amplitude of the mid-point O of the string is a , and tension in the string is T , Find the total oscillation energy stored in the string., π 2 a 2 T 4 L, π a T 2 L, - π 2 a 2 T 3 L, π 2 a T 6 L

MARKS App · Accepted Answer

λ 2 = L λ = 2 L τ = μ V 2 The amplitude at a distance x from the origin is given by A = a sinkx consider an element of mass dm and length dx of string at a distance x from the origin The total energy of this element = its maximum KE = 1 2 d m ω 2 A 2 = 1 2 μ d x ⁡ 4 π 2 f 2 a 2 sin 2 k ⁡ x (Because μ = dm dx and ω = 2πf and it is given that A = a sinkx ) total energy of string = ∫ 0 L 2 π 2 μ f 2 a 2 sin 2 k ⁡ x d x = π 2 μ f 2 a 2 [ x - sin 2 k ⁡ x 2 ] 0 L = π 2 μ f 2 a 2 L = π 2 μ V 2 λ 2 a 2 L = π 2 4 L 2 T a 2 L = π 2 a 2 T 4 L

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