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Cosmic noise is caused by ________

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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

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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.

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