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A baseband communication system has a distribution channel and power spectra density of white noise ?/2...

A baseband communication system has a distribution channel and power spectra density of white noise ?/2 of 10-8 W/Hz. The signal transmitted has a 5 k? bandwidth. If an RC low-pass filter with a 3 dB bandwidth of 10 kHz is used at the receiving end to limit noise power, determine the output noise power

I dont know why answer is 628.3um???

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