1: electrons become more energetic when they absorb a photon 2: as such ... A moving helium atom absorbs a photon of wavelength 12.2 angstrom and stops.
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The energy of the electron is given by this equation:
The atomic number, Z, of hydrogen is 1; k = 2.179 × 10–18 J; and the electron is characterized by an nvalue of 3. Thus,
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