JEE Main2015PhysicsAtomic PhysicsActual
As an electron makes a transition from an excited state to the ground state of a hydrogen-like atom/ion
Options
- Akinetic energy and total energy decrease but potential energy increases
- Bits kinetic energy increases but potential energy and total energy decrease
- Ckinetic energy, potential energy and total energy decrease
- Dkinetic energy decreases, potential energy increases but total energy remains same
Correct answer
B. its kinetic energy increases but potential energy and total energy decrease
Step-by-step solution
U = - e 2 4 πε 0 r , U = potential energy, K = e 2 4 πε 0 r K =kinetic energy. E = U + K = - e 2 8 πε 0 r , E =total energy ∴ As electron de-excites from an excited state to ground state, K increases, but U and E decrease.