The Franck-Hertz experiment proves that

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(C) The Franck-Hertz experiment demonstrated the existence of discrete energy levels in atoms by bombarding mercury vapor with electrons. When the kin

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the energy states of an atom are quantised

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(C) The Franck-Hertz experiment demonstrated the existence of discrete energy levels in atoms by bombarding mercury vapor with electrons. When the kinetic energy of the electrons reached a specific threshold,they lost energy to the mercury atoms,causing them to transition to higher energy states. This confirms the prediction of quantum theory that the energy states of an atom are quantised.

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