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MHT CET202012 Oct 2020Morning ShiftPhysicsWaves and SoundActual

Two identical wires are vibrating in unison. If the tension in one of the wires is increased by 2 % , five beats are produced per second by the two vibrating wires. The initial frequency of each wire is ( 1 02 1 01)

Options

  1. A1000 ~Hz
  2. B500 ~Hz
  3. C400 ~Hz
  4. D200 ~Hz

Correct answer

B. 500 ~Hz

Step-by-step solution

n 1 2 T m n T n ₂ n ₁ = T ₂ ~T ₁ = 1.02 ~T ₁ ~T ₁ = 1.02 =1.01 Also n ₂- n ₁=5 1.01 n ₁- n ₁=5 0.01 n ₁=5 n ₁= 5 0.01 =500 ~Hz

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