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The origin of atomic spectra can be explained using the quantum theory of radiation. When an atom absorbs energy, its electrons are excited from lower energy levels to higher energy levels. These energy levels are quantized, meaning electrons can only occupy specific energy states. As the excited electrons return to their lower energy levels, they emit energy in the form of electromagnetic radiation. This emitted ________ ___ __________ ______ _________ ____ ________ ___.
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