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At a distance of 25m from an isotropic 100 mhz radio source


At a distance of 25m from an isotropic 100 MHz radio source the intensity is 120W/m2.

1. What is the rms electric field at 25m?

 

2. Over a 2 hour period, what is the momentum given to a 4cm x 4cm surface (at the 25m distance) perpendicular to the source that reflects 3/4 of the energy?

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Physics: At a distance of 25m from an isotropic 100 mhz radio source
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