Which signal gets easily affected by external atmosphere and electrical disturbances?

Question

Question

This question was previously asked in

SSC Scientific Assistant Electronics Official Paper (Held On: 23 Nov 2017 Shift 1)

Answer 1

AM signals gets easily affected by external atmosphere and electrical signals.
It has a lower bandwidth so it can have more stations available in any frequency range.
AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant.
AM is more susceptible to noise because noise affects amplitude, which is where information is "stored" in an AM signal.
The major disadvantage of AM is that the signal is affected by electrical storms and other radio frequency interference.
Also, although the radio transmitters can transmit sound waves of frequency up to 15 kHz, most receivers are able to reproduce frequencies only up to 5kHz or less.