The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true 
(a) Its kinetic energy increases and its potential and total energies decrease
(b) Its kinetic energy decreases, potential energy increases and its total energy remains the same
(c) Its kinetic and total energies decrease and its potential energy increases
(d) Its kinetic, potential and total energies decreases

(a) For hydrogen and hydrogen like atoms En=-13.6z2n2 eV

Un=2En=-27.2 z2n2 eV and Kn=En=13.6 z2n2 eV  

From these three relations we can see that as n decreases, Kn will increase but En and Un will decreases.

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