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67. assignment (energy level)

-0.3 eV (third excited state)
-1.0 eV (second excited state)
-2.4 eV (first excited state)
-4.7 eV (ground state)

(a) Suppose that material containing many such objects is hit with a beam of energetic electrons that ensures that there are always some objects in all of these states. What are the six energies of photons that could be strongly emitted by the material? (In actual quantum objects there are often "selection rules" that forbid certain emissions even though there is enough energy; assume that there are no such restrictions here.)

List the photon emission energies in order from largest to smallest. If two different transitions would produce photons of the same energy, list that energy twice:

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