Question:-
X(t) is a stationary process with the power spectral density Sx(f)>0 for all f. The process is passed through a system shown below.

Let Sy(f) be the power spectral density of Y(t). Which one of the following statements is correct?
Option (A)
Sy(f)>0 for all f
Option (B)
Sy(f)=0 for |f|>1kHz
Option(C)
Sy(f)=0 for f=nf0, f0=2kHz, n any integer
Option(D)
Sy(f)=0 for f=(2n+1)f0=1kHz, n any integer
Correct Option:
(D)
question-answer-faq-2184