A source of frequency 500 Hz moves at 20 m/s away from a stationary observer. The speed of sound is 340 m/s. The observed frequency is:

  1. 500 Hz
  2. 472 Hz
  3. 531 Hz
  4. 425 Hz
Answer

B) 472 Hz

fo = fs vv + vs = 500 340340 + 20 = 472 Hz. SLO P-11-D-03 · Application

Physics MCQ · More Wave Intensity and the Doppler Effect MCQs · Practise