Question

# A sinusoidal carrier voltage of frequency $$10\:MHz$$ and amplitude $$200\:volts$$ is amplitude modulated by a sinusoidal voltage of frequency $$10\:kHz$$ producing $$40\%$$ modulation. Calculate the frequency of upper and lower sidebands.

A
10010kHz, 9990kHz
B
1010kHz, 990kHz
C
10100Hz, 9990Hz
D
1010MHz, 990MHz

Solution

## The correct option is D $$10010\:kHz$$, $$9990\:kHz$$Modulating signal frequency $$\rightarrow10\:kHz$$Carrier signal frequency $$\rightarrow10\:MHz$$$$\therefore$$ Side band frequency are$$USB=10\:MHz+10\:kHz=10010\:kHz$$$$LSB=10\:MHz-10\:kHz=9990\:kHz$$Physics

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