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    Question

    Which statement is true regarding Frequency

    Modulation(FM)?
    A In FM amplitude is constant but Phase varies. Correct Answer Incorrect Answer
    B In FM both amplitude and phase vary but frequency remains constant. Correct Answer Incorrect Answer
    C In FM amplitude varies and Phase remains constant. Correct Answer Incorrect Answer
    D In FM frequency varies and amplitude and phase remain constant. Correct Answer Incorrect Answer

    Solution

    In Frequency Modulation (FM), the carrier’s frequency changes according to the instantaneous amplitude of the message signal, while the amplitude of the carrier remains constant . This makes FM less susceptible to noise compared to Amplitude Modulation (AM), since most noise affects amplitude. Although frequency is the main varying parameter, phase is indirectly related to frequency change, but the amplitude stays fixed. This is why FM provides better sound quality and higher noise immunity, making it widely used in radio broadcasting.

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