The radar system at an airport broadcasts 11 ghz microwaves, Ask an Expert

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The radar system at an airport broadcasts 11 GHz microwaves with 150 kW of power. An approaching airplane with a 35 m² cross section is 36 kilometer away. Suppose that the radar broadcasts uniformly in all directions and that the airplane scatters microwaves uniformly in all directions.

Find the electric field strength of the microwave signal received back at the airport 240 micro seconds later?

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