The total energy of an electron in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively:
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Question

The total energy of an electron in an orbit is −3.4 eV. Its kinetic and potential energies are, respectively:

G1 Physics · Accepted Answer

For Coulombic bound orbits U = −2K and E = K + U = −K. Therefore K = −E = 3.4 eV and U = 2E = −6.8 eV. Answer: B.