Question

the frequencies of two side band in an am wave are 640khz and 660 khz respectively.find the frequencies of carrier and modulating signal.what is the bandwidth required for amplitude modulation

Answer 1

The frequencies of the two sidebands = 640 kHz ,   660 kHz

The frequency of the carrier = (640+660)/2 = 650 kHz.
The frequency of the modulating signal or data = (660-640)/2 = 10 kHz.

Bandwidth required for amplitude modulation = 2 * 10 kHz = 20 kHz