JEE PHYSICS MCQ: COMMUNICATION SYSTEMS

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A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 V. The modulation index and difference between the two side band frequencies are

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Correct option: C

0.25\,\,;\,\,\,\,2 \times {10^8}\;Hz

Option C (

0.25\,\,;\,\,\,\,2 \times {10^8}\,Hz

) is correct because the modulation index is the ratio of message amplitude to carrier amplitude, and the bandwidth is twice the message frequency.

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