A point source radiates 100 W of sound equally in all directions. The intensity 5 m away is:

  1. 1 W/m^2
  2. 1.27 W/m^2
  3. 1.59 W/m^2
  4. 0.318 W/m^2
Answer

D) 0.318 W/m^2

I = P4pi r^2 = 1004pi(5)^2 = 0.318 W/m^2. SLO P-11-D-01 · Application

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