JEE Main 2015 · 4 Apr · Shift 1 · Physics Q27

PhysicsSingle correct+4 / -1Question 27 of 90

As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion :

its kinetic energy increases but potential energy and total energy decrease

kinetic energy, potential energy and total energy decrease

kinetic energy decreases, potential energy increases but total energy remains same

kinetic energy and total energy decrease but potential energy increases

Answer and worked solution

Official answer: A

In a Bohr orbit $K=-E$ and $U=2E$ . Moving to the ground state makes $E$ more negative, so $K$ increases while $U$ and $E$ decrease.

JEE Main 2015 · 4 Apr · Shift 1, Physics question 27