A sinusoidal electromagnetic wave from a radio station passes perpendicularly th

Question

A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has an area of

A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has an area of 0.700 m2. At the window, the electric field of the wave has an RMS value of 2.150 times 10-2 N/C. What is the volume flux of electromagnetic radiation from the radio station which is passing through the open window? How much energy does this wave carry through the window during a 15-second radio commercial?

Explanation / Answer

a)the volume flux is

O = (V/t)

where V = A x L,A = 0.700 m^2 and L is length of window,t is time

b)the electric force on the window is

F = E x q

where E = 2.150 x 10^-2 N/C and q is the charge passing through the window

the energy carried by the wave is

U = F x L

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