A siren's observed frequency is 550 Hz while approaching and 450 Hz while receding (v = 340 m/s). The speed of the siren is:

  1. 100 m/s
  2. 34 m/s
  3. 68 m/s
  4. 17 m/s
Answer

B) 34 m/s

Ratio 550450 = 340 + vs340 - vs Rightarrow vs = 34 m/s. SLO P-11-D-03 · Application

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