A source of frequency 440 Hz moves at 15 m/s away from a stationary observer. The speed of sound is 343 m/s. The observed frequency is:

  1. 422 Hz
  2. 440 Hz
  3. 460 Hz
  4. 379 Hz
Answer

A) 422 Hz

fo = fs vv + vs = 440 343343 + 15 = 422 Hz. SLO P-11-D-03 · Application

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