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What was Niels Bohr's explanation for the observation of atomic spectra?

A) Electrons could only move in discrete energy steps within an atom.
B) Electrons could not move in an atom.
C) Any photon could excite an electron.
D) Only certain photons with the correct energy could excite the quanta in the nucleus.
E) Nucleons could be excited by different electron energies.

Marked as best answer by Josiane

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Please could you help me with another one. Thank you