A point source radiates 1 W of sound equally in all directions. The intensity 10 m away is:

  1. 7.96 10^-4 W/m^2
  2. 0.00318 W/m^2
  3. 0.0025 W/m^2
  4. 0.00796 W/m^2
Answer

A) 7.96 10^-4 W/m^2

I = P4pi r^2 = 14pi(10)^2 = 7.96 10^-4 W/m^2. SLO P-11-D-01 · Application

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