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TS EAMCET202313 May 2023Morning ShiftPhysicsWaves and SoundActual

An observer moves towards a stationary source of sound, with a speed of one-fifth of the speed of sound. The apparent increase in the frequency heard by the observer is

Options

  1. A16.67 %
  2. B2 %
  3. C25 %
  4. D20 %

Correct answer

D. 20 %

Step-by-step solution

From the Doppler's effect f^ =f₀ ( v₀ v₀ v v_s ) v _ s = velocity of source v ₀= velocity of observer y = velocity of sound Here v _ s =0 aligned & f^ =f_o ( v+v₀ v ) f^ f₀ = v+ v 5 v & = 6 5 & f^ -f_o f_o 100 %= 6-5 5 = 1 5 100 % & =20 % aligned

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