Question

Im aplitude modulation,

(1) Amplitude of the low frequency carrier signal is varied in accordance with the high frequency message signal

(2) Amplitude of the high frequency carrier signal is varied in accordance with the low frequency message signal

(3) Amplitude of the low frequency carrier signal is varied in accordance with the high frequency carrier signal

(4) Amplitude of the high frequency carrier signal is varied in accordance with the low frequency carrier signal

Answer 1

(2) Amplitude of the high frequency carrier signal is varied in accordance with the low frequency message signal

We need a high frequency carrier wave for effective transmisstion of low frequency message signals in amplitude modulation, it is the amplitude of the high frequency carriers wave that is varied in accordance with the low frequency message signal.