Posted by Sandhya on Friday, April 17, 2009 at 10:51pm.
There is a formula that relates radiation energy density to the E-field strength.
Get to know it.
Energy density = (1/2) epsilono * E^2
For an electromagnetic wave, there is an equal amount of energy in the magnetic field, as I recall.
For the E-field energy density at a distance R from that transmitter,
divide the radiated power by 4 pi R^2. That is the rate that energy is radiated away. Half of that power is due to the E-field. Divide by c for the E-field energy density. Set equal to the part (a) value and solve for R
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