The electron in a hydrogen atom makes a transition from an excited state to the ground state…

Q: The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statement is true ?

(A) Its kinetic energy increases and its potential and total energy decreases

(B) Its kinetic energy decreases, potential energy increases and its total energy remains the same

(C) Its kinetic energy and total energy decreases and its potential energy increases

(D) Its kinetic, potential and total energy decreases

Ans: (A)

$\large K.E \propto \frac{1}{n^2}$ (with +ve sign )

$\large P.E \propto \frac{1}{n^2}$ (with -ve sign )

$\large T.E \propto \frac{1}{n^2}$ (with -ve sign )