Question: An atom in a 3d state emits a photon of wavelength 475.082 run when it decays to a 2s state. (a) What is the energy

An atom in a 3d state emits a photon of wavelength 475.082 run when it decays to a 2s state.
(a) What is the energy (in electron volts) of the photon emitted in this transition?
(b) Use the selection rules described in Section 4l.2 to find the allowed transitions if the atom is now in an external magnetic field of 3.500 T, Ignore the effects of the electron's spin.
(c) For the case in part (b), if the energy of the 3d state was originally - 8.50000eV with no magnetic field present, what will be the energies of the states into which it splits in the magnetic field?
(d) What are the allowed wavelengths of the light emitted during transition in part (b)?

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