A sinusoidal electromagnetic wave has a peak electric field of What is the intensity of the wave? A)170 kW/m² B)85 kW/m² C)21 kW/m² D)11 kW/m²

Question

Quizplus · Accepted Answer

Intensity is given by the formula: I = (1/2) * ε * c * E_max^2
where ε is the electric permittivity of free space and c is the speed of light in vacuum. 
Substituting the given values, we get: 
I = (1/2) * (8.85 * 10^-12) * 3 * 10^8 * (11 * 10^6)^2 
I = 85 kW/m^2 
Therefore, the correct option is B, which gives the closest value to the calculated intensity.

A Sinusoidal Electromagnetic Wave Has a Peak Electric Field of