Problem 8:You want to be the first human to communicate with an extraterrestrial, so you use your rooftop laser to send a plane electromagnetic wave directly upward. The wave is polarized, with its magnetic field oscillating in the north-south direction at a frequency of4.8MHz with an rms amplitude of84mT.

25%Part (a)Assuming your electromagnetic wave is propagating through vacuum, what is its propagation speed, in meters per second?

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25%Part (b)At what frequency, in megahertz, is the wave's electric field oscillating? 25%Part (c)In what direction does the electric field oscillate? 25%Part (d)What is the rms amplitude of the oscillating electric field, in megavolts per meter?