A periodic composite signal contains sine harmonics with frequencies from 10 KHz

Question

A periodic composite signal contains sine harmonics with frequencies from 10 KHz to 70 KHz. The fundamental frequency of the first harmonic of this composite signal is 10 KHz and all harmonics in the range 10-70 KHz are included in the composite signal. The signal is transmitted over a channel that has attenuation of - dB for all frequencies less than or equal to 40 KHz and attenuation of -3 dB for all frequencies larger than 40 KHz. All harmonics have a maximum power of 20 milliwatts (mW) at the sender

Explanation / Answer

a)60 kHz

b)4 harmonics

c)30 kHz

d)60 mW

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