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huntingrdr
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Homework Statement
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?
The answer should be 213 V/m.
B) 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?
The answer should be 8.06*10^-6.
C) What is the total power transmitted by the source?
The answer should be 9.42*10^5.
Homework Equations
I=P/a = E^2max/2(u)(c)
The Attempt at a Solution
Emax = 274587.4
Erms=Emax/sqrt(2)
I can not get any of these parts right. I tried them but can't get the same results. Can someone show me how to get these? Thanks for the help!