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Excited barium atoms in an ICP at 9000 K will emit at 493.4 nm as a...

Excited barium atoms in an ICP at 9000 K will emit at 493.4 nm as a result of the electronic transition 6p -> 6s.  Find the ratio of excited barium atoms to unexcited barium atoms when the excited barium atoms emit electromagnetic radiation at 493.4 nm.

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