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What happens in frequency modulation?

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in Physics – Class 12 by (135k points)
What happens in frequency modulation?

(a) The amplitude of the modulated wave varies as the frequency of the carrier wave

(b) The frequency of the modulated wave varies as the amplitude of the modulating wave

(c) The amplitude of the modulated wave varies as the amplitude of the carrier wave

(d) The frequency of modulated wave varies as the frequency of modulating wave

This question was addressed to me in a national level competition.

My question is from Communication Systems in section Communication Systems of Physics – Class 12

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The correct answer is (b) The frequency of the modulated wave varies as the amplitude of the modulating wave

Easy explanation: The frequency of the modulated wave varies as the amplitude of the modulating wave. To generate a frequency modulated signal, the frequency of the radio carrier is changed in line with the amplitude of the incoming audio signal.

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