What are photons?
Aphoton is a bundle of electromag-netic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a 'quantum' of electromagnetic energy. All light is made of photons that are so small that they cannot be seen individ-ually. They behave in some ways like particles, and in other ways like waves. It is not just sunlight and visible light that is made up of photons; radio waves, television broadcasts, x-rays, and the ultraviolet rays are all made up of photons. The original concept of the photon was developed by Albert Einstein, but it was scientist Gilbert N. Lewis who first used the word 'photon' to describe this bundle of electromagnetic energy.
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