Q.56. In a hydrogen atom, if reference level of potential energy is assumed to be zero at ground state, then select the correct statement.
(1) Total energy of each level increases
(2) The difference in total energy of any two level remains same
(3) Kinetic energy in each level remains same
(4) All of these

 $$\begin{gathered} Total Energy in first excited state = -13.6/4 = -3.4 eV \\ Potential Energy in the first excited state = -6.8 eV \\ (-PE = 2 X -TE) For this to be zero, \\ We must add 6.8 eV. \\ So, add this 6.8 eV to all energy values to get the new values because shifting of zero \\ or reference simply shifts all energy by the same value. \\ Kinetic Energy in ground state = 13.6 eV \\ So, in new system = 13.6 + 6.8 = 20.4 eV \end{gathered}$$