2.3.4 A hydrogen atom exists with its electron in the n=5 state. The electron undergoes a transition to the n=3 state. Calculate (a) the energy of the photon emitted, (b) its frequency, and (c) its wavelength in nanometers (nm).
2.3.6 In a commercial x-ray generator, a stable metal such as Cu or Fe is exposed to an intense beam of high-energy electrons. These electrons cause ionization events in the metal atoms. When the metal atoms regain their ground state, they emit x-rays of characteristic energy and wavelength. For example,
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