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Excited state of atoms

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Tommyb323 | 23:38 Wed 03rd Jan 2007 | Science
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which of the following events cannot raise an atom from its ground state to an excited state?

spontaneous emission of a photon
induced emission of a photon
absorption of a photon
a collision with another atom
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The atom needs to absorb energy from elsewhere in order to change to a more excited state, so you just need to think which of these involves the atom losing energy (e.g. by emitting a photon) without taking in any energy from another source.
11:24 Mon 21st Jul 2008

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