A point source radiates 40 W of sound equally in all directions. The intensity 2 m away is:

  1. 0.796 W/m^2
  2. 3.18 W/m^2
  3. 1.59 W/m^2
  4. 2.5 W/m^2
Answer

A) 0.796 W/m^2

I = P4pi r^2 = 404pi(2)^2 = 0.796 W/m^2. SLO P-11-D-01 · Application

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