At a distance of 25m from an isotropic 100 MHz radio source the intensity is 120W/m2 (a) What is the rms electric field at 25m? (b) Over a 2 hour period, what is the momentum given to a 4cm´4cm surface (at the 25m distance) perpendicular to the source that reflects 3/4 of the energy? (c) What is the total power transmitted by the source?

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