An Electron in an Atom Initially Has an Energy 7

question 3

Multiple Choice

An electron in an atom initially has an energy 7.5 eV above the ground state energy. It drops to a state with an energy of 3.2 eV above the ground state energy and emits a photon in the process. The momentum of the photon is:

• A) 1.7 * 10^-27 kg .m/s
• B) 2.3 *10^-27 kg . m/s
• C) 4.0 * 10^-27 kg . m/s
• D) 5.7 * 10^-27 kg .m/s
• E) 8.0 * 10^-27 kg . m/s

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