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An excited hydrogen atom emits light with a frequency of 1.141x10^14 Hz to reach the energy level for which n=4. In what principle quantum level did the electron begin?
13 years ago

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DrBob222
Calculate wavelength from c = frequency*wavelength, then
1/w = 1.097E7(1/n - 1/4^2)
Solve for n. w must be in meters.
13 years ago

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