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In AM (amplitude modulation), modulating signal varies:
AAmplitude (envelope) of carrier; carrier frequency fixed
BFrequency
CPhase
DRandom
Answer & Solution
Correct answer: A. Amplitude (envelope) of carrier; carrier frequency fixed
AM: amplitude varies with information signal. Mathematically: s_AM(t) = (A + m(t)) cos(ω_c t). Modulation index μ = m_max/A. Over-modulation (μ > 1) → envelope distortion. Bandwidth: 2 × m_max frequency.
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