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For getting 100% modulation, carrier amplitude should ________

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For getting 100% modulation, carrier amplitude should  ________

(a) exceed signal amplitude

(b) be equal to signal amplitude

(c) be lesser than signal amplitude

(d) be equal to 0

This question was addressed to me by my college director while I was bunking the class.

This intriguing question originated from Power Relations in AM Waves topic in section Amplitude Modulation of Analog Communications

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Right choice is (b) be equal to signal amplitude

Easiest explanation: Modulation index is the amount of modulation present in a carrier wave. It is also described as the ration of the amplitude of message signal to that of carrier signal.

Modulation Index (m) = Vm/Vc, where Vm is maximum baseband or message signal amplitude and Vc is maximum carrier signal amplitude. So for m = 1, Vm should be equal to Vc.

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