An electromagnetic wave has a frequency of 120 MHz and is traveling in a vacuum.

Question

An electromagnetic wave has a frequency of 120 MHz and is traveling in a vacuum. The magnetic field is given by (z, t) = (4.00 10-8 T) cos (kz - ?t). (Assume the electromagnetic wave is travelling in the direction.)

(a) Find the wavelength of this wave.
? m

(b) Find the electric field vector (z, t). (Use the following as necessary: z, and t.)
(z, t) = ?
. V/m

(c) Determine the Poynting vector. (Use the following as necessary: z, and t.)
(z, t) = ?
mW/m2

(d) Using this Poynting vector, find the intensity of the wave.
I = ? mW/m2

Explanation / Answer

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