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Most Important Selected Qs for JEE AdvancedPhysicsWaves and Sound

A string of length l is stretched by l 10 and the velocity of transverse waves along it is V . When it is stretched by l 20 (assuming Hooke's law is applicable), the velocity of waves will become:

Options

  1. AV
  2. B2 ~V
  3. CV 2
  4. D2 V

Correct answer

C. V 2

Step-by-step solution

T l V= T = k l m l = k( l) l m V ( l) l V₂ V₁ = ( l₂ ) l₂ ( l₁ ) l₁ = (0.05) 1.05 0.1 1.10 V₂ V₁ = 1 2 V₂= V 2

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