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MHT CET Medical202622 April 2026Morning ShiftPhysicsWaves and SoundActual

A source of sound emitting a note of frequency n₀ is approaching a stationary listener. If the frequency of the note heard by the listener 3n₀ , the velocity of the source (V_s) is equal to [ V = Velocity of sound in air]

Options

  1. A2V
  2. B2V 3
  3. CV 2
  4. DV 3

Correct answer

B. 2V 3

Step-by-step solution

Using the Doppler effect formula for a source approaching a stationary listener: n' = n₀ ( V V - V_s ) Substituting the given values, n' = 3n₀ : 3n₀ = n₀ ( V V - V_s ) 3 = V V - V_s 3V - 3V_s = V 2V = 3V_s V_s = 2V 3 Answer: 2V 3

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