A) \[RC=\frac{1}{f}\]
B) \[RC<\frac{1}{f}\]
C) \[RC\ge \frac{1}{f}\]
D) \[RC>>\frac{1}{f}\]
Correct Answer: D
Solution :
From the modulated signal, we can demodulate or detect the modulating or message signal by using a diode and a suitable capacitor filter. The \[AM\] signal given to the input of the circuit appears at the output of the diode as a rectified wave. For good demodulation of \[AM\] signal the value of RC (which is a lime-constant) is chosen such that \[\frac{1}{f}<\,\,<RC\] or \[RC>\,\,>\frac{1}{f}\] where \[f\] is the frequency of the carrier signal.
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