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An electron in hydrogen's ground state has total energy -13.6 eV. What is its kinetic energy?
A+13.6 eV
B+27.2 eV
C-13.6 eV
D+6.8 eV
Answer & Solution
Correct answer: A. +13.6 eV
Kinetic energy is e²/8πε₀r and total energy is its negative, so K = +13.6 eV and potential energy is -27.2 eV.
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