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Posted in Coloured Television on 10/08/2008 05:11 am by admin
Please help! Electromagnetic energy signals?
I spent about an hour online looking for advice on how do this, so please help! I posted this in physics, but noted that more than questions remained unanswered. public television station KQED in San Francisco emissions sinusoidal supply a 316 kW radio signal. Suppose that the wave propagates uniformly in a hemisphere above the ground. a. Within 5.50 kilometers away from the antenna, this means they can put pressure on a reflective surface waves completely? B. Within 5.50 km away from the antenna, is amplitude of the wave electric and magnetic fields? Thank you very much! Please give the equations and steps used to obtain the answer. Please, please give the equations and steps used to arrive at the answer.
Received power = (3.16 x 10 ^ 5) / ((4) (pi) (R ^ 2) = watt Micro received 831 / square meter of space impedance is 377 ohms = Power received electric field ^ 2 / electric field = 377 square root (377 * 831) = 560 mV meters magnetic field = 560/377 = 1.48 milliamps per meter
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