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Question
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 x10-27kg .m/s
B) 2.3 x10-27kg .m/s
C) 4.0 x10-27kg .m/s
D) 5.7 x10-27kg .m/s
E) 8.0 x10-27kg .m/s
Answer
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