An electromagnetic wave has an electric field with a peak value of 250 N/C. What is the average intensity of the wave? A)0.66 W/m² B)0.89 W/m² C)83 W/m² D)120 W/m² E)170 W/m²

Question

Quizplus · Accepted Answer

The average intensity of an electromagnetic wave is given by I=1/2ε0cE0^2, where ε0 is the permittivity of free space, c is the speed of light, and E0 is the peak value of the electric field. Plugging in the given values, we get I=1/2(8.85x10^-12)(3x10^8)(250)^2=83 W/m^2. Therefore, the correct answer is C.

An Electromagnetic Wave Has an Electric Field with a Peak