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MHT CET202020 Oct 2020Morning ShiftPhysicsWaves and SoundActual

If we add 3 ~kg load to the hanger of sonometer, the fundamental frequency becomes two times its initial value. The initial load must be

Options

  1. A2 ~kg
  2. B1 5 ~kg
  3. C2 5 ~kg
  4. D1 ~kg

Correct answer

D. 1 ~kg

Step-by-step solution

n T n ₁ n ₂ = T ₁ ~T ₂ 1 2 = ( T T+3 )^ 1 / 2 1 4 = T T+3 1+ 3 T =4 3 T =3 T=1 ~kg

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