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Q.

A message signal of angular frequency ωm is superposed on carrier wave of frequency ωc to get an amplitude modulated wave (AM wave). Then one the angular frequency of the AM wave is

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a

Equal to the amplitude index of the carrier wave 

b

Equal to the amplitude of the carrier wave

c

Equal to the modulation of the carrier wave 

d

Equal to the angular frequency of carrier wave

answer is D.

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Detailed Solution

The frequency of the A.M. wave is equal to the unmodulated carrier angular frequency ‘ωc’.

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A message signal of angular frequency ωm is superposed on carrier wave of frequency ωc to get an amplitude modulated wave (AM wave). Then one the angular frequency of the AM wave is