What are carrier waves ?

What is the carrier wave? Why high frequency carrier waves are employed for transmission?

What do you mean by bandwidth of carrier waves ?

How are carrier wave produced?

If a number of sine waves with modulation indices n,n,n ........ modulate a carrier wave, then total modulation index ( n ) of the wave is

A modulated carrier wave has maximum and minimum amplitudes of 800 m v and 200 m V. What is the percentage modulation?

A modulated carrier wave has maximum and minimum amplitudes of 800 mV and 200 mV , respectively. What is the percentage modulation?