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QJEEM23Phe1b3: JEE Main 2023 Physics - Class 12 JEEM23Phe1b3 Solution: In an amplitude modulation, a modulating signal having…

In an amplitude modulation, a modulating signal having amplitude of X Volt is superimposed with a carrier signal of amplitude Y Volt in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude 2Y Volt. The ratio of modulation index in the two cases respectively will be :

Multiple Choice Options

  • A 2:01
  • B 1:01
  • C 4:01
  • D 1:02

Step-by-Step Verified Solution

The modulation index is a measure of the degree of modulation and is given by the ratio of the amplitude of the modulating signal to the amplitude of the carrier signal.

In the first case, the modulation index is XY{X \over Y} .

In the second case, the modulation index is X2Y{X \over {2Y}} .

The ratio of the modulation index in the two cases is XYX2Y=21{{{X \over Y}} \over {{X \over {2Y}}}} = {2 \over 1}

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