See your other post above.
https://www.jiskha.com/questions/1779568/what-is-the-wavelength-of-a-photon-emitted-during-a-transition-from-the-initial-state-ni-5
calculate the energies of the states of the hydrogen atom with n=2 and n=3, and calculate the wavelength of the photon emitted by the atom when an electron makes a transition between these two states.
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