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A hydrogen atom absorbs a photon and makes a transition from a 3d level to a 4f level. What is the wavelength of the absorbed photon ?

As i know 3d is n = 3, 4f is n = 4

and wavelength = hc/delta E

so the deltaE is E4 - E3 or E3 - E4 ??

thanks..

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# Homework Help: Quantum mechanics in atoms question

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