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How are excited electrons related to street lights, advertising signs and lasers?

I know the theory behind it – when an element is heated its electrons can absorb energy and the electron jumps to a higher energy level. When the electron jumps back it emits a photon of a certain colour.

So, how is this related to street lights, advertising signs and lasers?

They are light emitting, which means they give off photons.

Web lights up over NASA’s signs of Alien Life

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