What are the (a) Frequency, in s -1 , and (b) Wavelength, in nanometers, of the light

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What are the 

(a) Frequency, in s-1, and 

(b) Wavelength, in nanometers, of the light emitted when the electron in a hydrogen atom drops from the energy level n = 7 to n = 4?

(c) In what portion of the electromagnetic spectrum is this light?

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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