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