Cosmic noise is caused by ________
A. Distant stars
B. Lightning discharge
C. Solar eruptions
D. Disturbances in the atmosphere
I got this question in exam.
My question is based upon Threshold Effect in FM topic in chapter Noise of Analog Communications
The correct option is A. Distant stars
The explanation: Cosmic noise a random noise that originates from outside the earth’s atmosphere. It can be detected and heard on radio receivers.