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Which of the following statement is true about the spectrum of frequency modulated wave?

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Which of the following statement is true about the spectrum of frequency modulated wave?

(a) carrier frequency starts decreasing at a faster rate when the modulation index is large

(b) the amplitude of any sideband is totally depends on modulation index

(c) total number of sidebands is completely depend on the modulation index

(d) carrier frequency is amplified

The question was asked by my college director while I was bunking the class.

Enquiry is from Noise for SSB-SC topic in division Noise of Analog Communications

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Right answer is (b) the amplitude of any sideband is totally depends on modulation index

The explanation: In frequency modulation, frequency of wave is modulated with respect to the wave being propagated. In frequency modulation, the amplitude of any side band depends on modulation index.

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