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4. (a) A hydrogen atom in an excited state emits a photon with a wavelength of 1094 nrn. What was the initial and nal principle

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4. (a) A hydrogen atom in an excited state emits a photon with a wavelength of 1094 nrn. What was the initial and nal principle quantum number n of the electron? (4) (b) Show that the average value of the orbital radius 7" for a 1.5 electron in a hydrogen atom is given by 1.5%. Given: 2 e'r/a" and YOU: R = 10 053/2 2

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