Photon

 

A quantum of electromagnetic radiation, light. Light we experience in everyday life is in fact a 'swarm' of electromagnetic quanta i.e. Photons. Each photon carries a quantum of energy which is equal to planck's constant times its frequency. Photon frequency is nontrivially related to color we observe if it is within a visible part of the electromagnetic radiation spectrum. X-ray photons for example are not visible. Due to their high energy, they can penetrate through matter.

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The ultimate unit (a quantum) of light energy.

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A particle that is a packet of light

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