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Struktur atomDasar

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Hydrogen levels are En=−13.6n2 eVE_n=-\dfrac{13.6}{n^2}\ \mathrm{eV}. A collection of ground-state hydrogen atoms absorbs photons of 12.75 eV12.75\ \mathrm{eV} and is excited; the atoms then drop to lower levels. Of the photons emitted, the one with the lowest energy has energy ( ).
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