Communication

Question 1

What is an Amplitude modulated wave?

Answer 1

This is a wave in which the amplitude of the carrier wave varies in synchrony with the displacement of the information signal.

Question 2

What is a frequency modulated wave?

Answer 2

This is when the frequency of the carrier wave varies on synchrony with the displacement of the information signal.

Question 3

What are the reasons why a transmitted wave is modulated rather than transmitting the information signal directly as a radiowave?

Answer 3

To allow more than one radio station to operate in the same region.
There is less interference.
It enables a shorter aerial.
There is: increased range, less power required, less attenuation, and less distortion.

Question 4

What are the channels in which information is carried?

Answer 4

Wire pairs
Coaxial cables
Radio and micro wave links
Optic fibers