A progressive wave has intensity 10 W/m^2. If its amplitude is multiplied by 3, its new intensity is:

  1. 180 W/m^2
  2. 45 W/m^2
  3. 900 W/m^2
  4. 90 W/m^2
Answer

D) 90 W/m^2

I propto A^2, so I = 10 (3)^2 = 90 W/m^2. SLO P-11-D-01 · Application

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