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MHT CET202122 Sep 2021Evening ShiftPhysicsWaves and SoundActual

A tuning fork of frequency ' n ' is held near the open end of tube which is closed at the other end and the length are adjusted until resonance occurs. The first resonance occurs at length L ₁ and immediate next resonance occurs at length L ₂ . The speed of sound in air is

Options

  1. An ( L ₂- L ₁ )
  2. Bn ( L ₂- L ₁ ) 2
  3. C2 n ( L ₂- L ₁ )
  4. Dn ( L ₂+ L ₁ ) 2

Correct answer

C. 2 n ( L ₂- L ₁ )

Step-by-step solution

For first resonance L ₁= 4 For second resonance L ₂= 3 4 aligned & L ₂- L ₁= 2 or =2 ( ~L ₂- L ₁ ) & V = n =2 n ( L ₂- L ₁ ) aligned

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