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:
-3.4 eV
-6.8 eV
6.8 eV
3.4 eV
For an electron in a stable orbit of a hydrogen atom, the total energy (E) is related to its kinetic energy (K) by the relationship E = -K. Since the total energy is given as E = -3.4 eV, the kinetic energy is K = -(-3.4 eV) = +3.4 eV. Alternatively, kinetic energy is always positive, and its magnitude equals the magnitude of the total binding energy.
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