The total energy of electron in the ground state of hydrogen atom is -13.6 eV. The kinetic energy of an electron in the first excited state is

Total energy of electron in the orbit is equal to negative of its kinetic energy.The energy of hydrogen atom when the electron revolves in nth orbit isE=−13.6n2eVIn the ground state n=1E=−13.612=−13.6eVFor n=2,E=−13.622=−3.4eVSo, kinetic energy of electron in the first excited state (i.e., for n = 2) isK = -E = -(-3.4) = 3.4 eV