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AP EAMCET202421 May 2024Morning ShiftPhysicsWaves and SoundActual

A car sounding a horn of frequency 1000 Hz passes a stationary observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11: 9 . The speed of car is (Speed of sound v=340 ~ms ⁻¹ )

Options

  1. A34 ~ms ⁻¹
  2. B17 ~ms ⁻¹
  3. C170 ~ms ⁻¹
  4. D340 ~ms ⁻¹

Correct answer

A. 34 ~ms ⁻¹

Step-by-step solution

f =1000 ~Hz When the car approaching the observer, f₁= ( v v-v_s ) f When the car moving away from the observer, aligned & f₂= ( v v+v_s ) f & f₁ f₂ = v+v_s v-v_s 11 9 = 340+v_S 340-v_s & Velocity of car, v_s=34 ~ms ⁻¹ aligned

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