An Electron in an Atom Initially Has an Energy 7

question 18

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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