An electron moving in a stationary Coulombic Bohr orbit has kinetic energy 13.6 eV. Which pair gives its electrostatic potential energy U and total energy E?
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Question

An electron moving in a stationary Coulombic Bohr orbit has kinetic energy 13.6 eV. Which pair gives its electrostatic potential energy U and total energy E?

G1 Physics · Accepted Answer

For a Coulombic bound orbit, U = −2K and E = K+U = −K. Given, K = 13.6 eV. Therefore, U = −2×13.6 = −27.2 eV. Total energy: E = −13.6 eV. Correct option: B.