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(D) The line spectrum of the hydrogen atom provides evidence for the quantization of energy levels.When an electron transitions from a higher energy l

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an electron in an excited state loses energy in the form of bundles or packets of energy

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(D) The line spectrum of the hydrogen atom provides evidence for the quantization of energy levels.When an electron transitions from a higher energy level $(n_2)$ to a lower energy level $(n_1)$,it emits a photon.The energy of this emitted photon is given by $\Delta E = E_2 - E_1 = h
u$.This indicates that the energy is not lost continuously,but rather in discrete bundles or packets of energy called quanta or photons.

The observation of the line spectrum of the hydrogen atom indicates that

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