Question:

What is the intensity of a electromagnetic plane wave, multiple choice physics problem please help!?
An electromagnetic plane wave with E-field given by E = 2.0 (V / m) x sin (kx - wt) y What is the intensity of this wave? (intensity = average energy transported per unit area) a. 2.65 mW/m^2 b. 5.3 mWm^2 c. 10.6 mW/m^2 d. 1.6 MW/m^2 e. 3.2 MW/m^2 f. 5.1 kW/m^2 g. 7.6 kW/m^2 h. 3.1 W/m^2 i. 82 W/m^2

Answers:

A-Best: I = 1/2*εo*c*Emax^2 = 1/2*8.854x10^-12*3.0x10^8*2^2 = 5.3x10^-3 W/m^2 = 5.3mW/m^2 answer b