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1900's Physics and Wave

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Question

A message signal of frequency $20 k H z$ is used to modulate a carrier of figure $1.5 M H z$ . The side bands produced are:

A

520 k H z, 480 k H z

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B

1520 k H z, 1480 k H z

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C

1500 k H z, 50 k H z

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D

1020 k H z, 98 k H z

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Solution

The correct option is B $1520 k H z, 1480 k H z$
The message signal is super positioned on the carrier wave.
Thus side bands produced have frequencies=Carrier Frequency $\pm$ Message Frequency
$= 1.5 M H z \pm 20 k H z$
$= 1520 k H z, 1480 k H z$

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