Cosmic noise is caused by ________ A. Distant stars B. Lightning

cosmic-noise-is-caused-by-a-distant-stars-b-lightning

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.