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A certain radar, operating at 3 GHz, with an antenna of gain of 40 dB (assumed...

A certain radar, operating at 3 GHz, with an antenna of gain of 40 dB (assumed the same for both transmission and reception) and a peak power of 1MW, can reliably detect a target if the peak power in the returned signal is at least 5 times the system noise power. If the noise power is 10-12 W, estimate the smallest radar cross section the system can detect at 40 km.

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