As the electron in Bohr orbit of Hydrogen atom passes from state n = 2 to n = 1 , the kinetic energy K and potential energy U change as

K four-fold, U also four-fold

U = 2E, K = −E  and  $E=-\frac{13.6}{n^2}= e V$

$\Rightarrow K_n \propto \frac{1}{n^2}$

And $ U_n \propto \frac{1}{n^2}$

As n changes from n= 2 to n= 1, Both K and U changes 4 fold.