Q13 / 201 · NTA Abhyas (NEET) 2020 · Physics · Atomic Physics

An electron makes a transition from an excited state to the ground state of a hydrogen-like atom. Then

A
Kinetic energy decreases, potential energy increases but total energy remains same
B
Kinetic energy and total energy decrease but potential energy increases
Correct answer
C
Its kinetic energy increases but potential energy and total energy decrease
D
Kinetic energy, potential energy and total energy decrease

Solution

U = - K \frac{z e^{2}}{r}; TE = - \frac{k}{2} \frac{z e^{2}}{r}

KE = \frac{k}{2} \frac{z e^{2}}{r}

. Here

r

decreases

Hence, the correct answer is option: 'C'.