A 1 mW signal having a bandwidth of 100 MHz is transmitted to a receiver through cable that has 40 dB loss. If the effective one side noise spectral density at the receiver is 10-20 Watt/Hz, then the signal to noise ratio at the receiver is

A 1 mW signal having a bandwidth of 100 MHz is transmitted to a receiv

1.	A 1 mW signal having a bandwidth of 100 MHz is transmitted to a receiver through cable that has 40 dB loss. If the effective one side noise spectral density at the receiver is 10-20 Watt/Hz, then the signal to noise ratio at the receiver is
A.	50 dB
B.	30 dB
C.	40 dB
D.	60 dB
Answer» B. 30 dB