Most of us think of light as a wave.
Waves easily explain interactions such as reflection.
However, early in the 20th century, some scientists noticed that light hitting a metal surface
can sometimes eject electrons.
How can light waves do this?
Albert Einstein showed this can only happen if light is made up of tiny particles called
photons.
Einstein revolutionized physics by describing light as photons.
Scientists now believe light exhibits both wave and particle properties.
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