The total energy of an electron in the first excited state of hydrogen is about -3.4 eV. Its kinetic energy in this state is:
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Question

The total energy of an electron in the first excited state of hydrogen is about −3.4 eV. Its kinetic energy in this state is:

G1 Physics · Accepted Answer

Virial theorem for a Bohr orbit gives E = −K. With E = −3.4 eV, the kinetic energy is +3.4 eV. Answer: A.