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a) An electron in a quantum system has allowed energies 1eV, 3eV and 9 eV. What...

a) An electron in a quantum system has allowed energies 1eV, 3eV and 9 eV. What wavelengths are observed in the emission spectrum of this system? Show your work.
b) If you must choose from wavelengths obtained in part a) as light source for a photoelectric effect demonstration, with which material(s) will you build your cathode, and with what wavelength you would shine on it?
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