Question

In Amplitude Modulation , the A.F. (audio-frequency) modulating wave is superimposed on a R.F. (radio-frequency) carrier wave in such a manner that :

• A. the frequency of modulated wave is same as that of the carries wave.
• B. the amplitude of modulated wave is same as that of the carries wave.
• C. it's amplitude varies in accordance with instantaneous amplitude of the modulating wave.
• D. the frequency of the carrier wave is changed in accordance with the amplitude of the modulated wave.

Answer 1

Answer: (A), (C)

The correct options are
A the frequency of modulated wave is same as that of the carries wave.
C it's amplitude varies in accordance with instantaneous amplitude of the modulating wave.

In Amplitude Modulation , the audio frequency of modulating wave is superimposed on R.F. carrier wave such that the frequency of modulated wave is same as that of carrier wave and it's amplitude is changed according to the modulating wave . This is the process of Amplitude modulation (AM) and the modulated wave is called AM wave.