As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion: (a) kinetic energy decreases, potential energy increases but total energy remains same (b) kinetic energy and total energy decrease but potential energy increases (c) its kinetic energy increases but potential energy and total energy decrease (d) kinetic energy, potential energy and total energy decrease

Answer: (c). KE = (kZe²)/(2r), PE = -(kZe²)/(r), TE = -(kZe²)/(2r). Going to the ground state r decreases: KE increases, PE and TE decrease (more negative). So the answer is (c).

As an electron makes a transition from an excited state to the ground… | JEE Main 2015

Q45JEE Main 2015Easy

Energy of the Electron & Energy Levels

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

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Answer: (c)

$KE = \frac{kZe^2}{2r}$ , $PE = -\frac{kZe^2}{r}$ , $TE = -\frac{kZe^2}{2r}$ .
Going to the ground state $r$ decreases: KE increases, PE and TE decrease (more negative).
So the answer is (c).

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