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Which occurs due to equilibrium fluctuations?

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Which occurs due to equilibrium fluctuations?

(a) Thermal noise

(b) Johnson noise

(c) Thermal & Johnson noise

(d) None of the mentioned

This question was addressed to me by my school principal while I was bunking the class.

This intriguing question comes from Noise topic in portion Signals and Spectra of Digital Communications

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The correct choice is (c) Thermal & Johnson noise

To explain I would say: Thermal noise occurs due to equilibrium fluctuations. This noise is also called as Johnson noise.

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