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An audio signal is modulated by a carrier wave of 20MHz such that the bandwidth required for modulation is 3kHz. Could this wave be demodulated by a diode detector which has the values of R and C as 

(i) R = 1 kΩ, C = 0.01μF. (ii) R = 10 kΩ, C = 0.01μF. (iii) R = 10 kΩ, C = 0.1μF.

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Here 1/fc> RC, so this cannot be demodulated.

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