Question

In an amplitude modulated wave, for audio frequency of 500 cps , what is the approximate carrier frequency?

Answer 1

Normally the carrier frequency is supposed to be greater than the audio frequency. For audio signals of human speech and musical instruments with frequencies to 20 khz, we use a carrier frequency greater than 20 khz.

We use a carrier frequency > audio freq
    or ,  carrier frequency >  500 hz

Answer 2

carrier frequency should be greater than audiofrequency.here the audio frequency is 500hz so carrier frequency >20khz