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Quanta is used to describe any substance that holds a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents. Therefore, the word "quanta" is used to describe photons because they are packets of discrete energy. Essentially, quanta is a broad term that can be applied to photons based on their characteristics and behavior. Hope this helps!
Hi! A quantum is the smallest particle of any substance at the subatomic level. A photon is, more specifically, the smallest discrete amount of electromagnetic radiation, or quantum of light. Hope this helps!
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