Problem: An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 138 THz.What is the value of n for the level in which the electron originated? Express your answer as an integer.

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An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 138 THz.

What is the value of n for the level in which the electron originated? Express your answer as an integer.

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