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Excitation and deexcitation: Day 1, P1
Let there be light!
Introduction
So far the only way we've seen for an atom to go from an excited state to
the ground state is for it to collide with another atom and give up its
stored energy that way. But there's another way for an atom to shed its
energy. It can give off light!
(Should be a picture of a neon light, preferably one that spells something)
You see atoms give off light every day. For example, in a neon bulb an electric current excites the atoms, which then decay back to the ground state. As they do this, they give off a characteristic red light. No other atom radiates that particular shade of red.
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