Q: Find the kinetic energy, potential energy and total energy in first and second orbit of hydrogen atom if
potential energy in first orbit is taken to be zero.
Sol: E1 = -13.60 eV ; K1 = -E1 = 13.60 eV
U1 = 2 E1 = -27.20 eV E2 = -3.40 eV K2 = 3.40 eV and U2 = -6.80 eV
Now, U1 = 0, i.e., potential energy has been increased by 27.20 eV. So, we will increase U and E in all
energy status by 27.20 eV while kinetic energy will remain unchanged .
Hence K (eV), U(eV), E(eV)
First orbit are 13.6 , 0 , 13.6
In second orbit 3.40 , 20.40 , 23.80