A car horn of 400 Hz is heard as 425 Hz as the car approaches (v = 340 m/s). The car's speed is:

  1. 20 m/s
  2. 40 m/s
  3. 10 m/s
  4. 25 m/s
Answer

A) 20 m/s

425 = 400 340340 - vs Rightarrow vs = 340 - 320 = 20 m/s. SLO P-11-D-03 · Application

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