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A small object is emitting P watts isotropically in space. A receiver of area A is located at a distance d from the object. a.

A small object is emitting P watts isotropically in space. A receiver of area A is located at a distance d from the object. a. How much of the emitted power is being intercepted by the receiver? b. What size of a circular receiver is needed to receive 1 milliwatt if P = 1 kW and d = 1000 km?

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