n the Hydrogen atom, an electron gains energy and moves from n=2 of energy -3.39 eV to n=3 of energy -1.51 eV. It is unstable and returns from n=3 to n=2. Calculate the frequency and the wavelength of the emitted photon. E = hf and h = 6.63 x 10-34.  Why the emitted photons from a Hydrogen atom only have certain colours?

Chemistry: The Molecular Science
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Author:John W. Moore, Conrad L. Stanitski
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Chapter5: Electron Configurations And The Periodic Table
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In the Hydrogen atom, an electron gains energy and moves from n=2 of energy -3.39 eV to n=3 of energy -1.51 eV. It is unstable and returns from n=3 to n=2. Calculate the frequency and the wavelength of the emitted photon. E = hf and h = 6.63 x 10-34

Why the emitted photons from a Hydrogen atom only have certain colours?

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