Identify which of the following is the smallest discrete value of any quantity in physics ?

atom

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molecule.

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proton

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electron

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quantum

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Solution

The correct option is D quantum
Quantum is the minimum amount of any physical entity involved in an interaction. It is a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents. It implies that the magnitude of the physical property can take on only certain discrete values.
A photon is a quantum of visible light.

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