A source of frequency 800 Hz moves at 40 m/s away from a stationary observer. The speed of sound is 340 m/s. The observed frequency is:

  1. 644 Hz
  2. 716 Hz
  3. 907 Hz
  4. 800 Hz
Answer

B) 716 Hz

fo = fs vv + vs = 800 340340 + 40 = 716 Hz. SLO P-11-D-03 · Application

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