Question

The average noise power of white noise is

(a) 0

(b) Infinity

(c) 1

(d) None of the mentioned

The question was asked in an interview for internship.

Enquiry is from Signals and Noises topic in chapter Baseband Demodulation and Detection of Digital Communications

Answer 1

Correct answer is (b) Infinity

For explanation I would say: White noise is a idealized process with two sided spectral density equal to constant N0/2 and frequencies varying from minus infinity to plus infinity. Thus the average noise power is infinity.