Discussion
The RC time constant of a diode detector must be
Answer: C
The constant must satisfy both inequalities at once: long enough to smooth the carrier ripple and short enough to follow the envelope. Too short and carrier ripple appears at the output; too long and the detector cannot follow the falling envelope, which is diagonal clipping. The reversed condition would smooth away the message and pass the carrier. Equality with the carrier period leaves heavy ripple. And a constant longer than the message period is precisely the failure case.
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