A progressive wave has intensity 9 W/m^2. If its amplitude is multiplied by 0.5, its new intensity is:

  1. 22.5 W/m^2
  2. 2.25 W/m^2
  3. 4.5 W/m^2
  4. 1.12 W/m^2
Answer

B) 2.25 W/m^2

I propto A^2, so I = 9 (0.5)^2 = 2.25 W/m^2. SLO P-11-D-01 · Application

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