Question: An electron is confined to a one-dimensional box. When the electron makes a transition from its first excited state to the ground state, it emits

An electron is confined to a one-dimensional box. When the electron makes a transition from its first excited state to the ground state, it emits a photon of energy 1.2 eV.
(a) What is the ground-state energy (in electronvolts) of the electron?
(b) List all energies (in electronvolts) of photons that could be emitted when the electron starts in its second excited state and makes transitions downward to the ground state either directly or through intervening states. Show all these transitions on an energy level diagram.
(c) What is the length of the box (in nanometers)?

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