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NTA Abhyas JEE Main2020PhysicsWaves and SoundPractice

Two coherent sound sources A and B produce a sound of wavelength λ . If at t = 0 a detector starts moving with constant velocity v 0 from point O along y-direction, then the minimum time, after which it detects the sound of maximum intensity, is D > > λ

Options

  1. A7 D v 0
  2. BD 3 v 0
  3. CD v 0
  4. D7 D 3 v 0

Correct answer

D. 7 D 3 v 0

Step-by-step solution

4 λ c o s θ = 3 λ c o s θ = 3 4 ⇒ t a n θ = y D ⇒ y = 7 D 3 t = 7 D 3 v 0

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