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Q.

The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true

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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

answer is A.

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Detailed Solution

For hydrogen and hydrogen like atomsEn=−13.6z2n2eV Un=2En=−27.2z2n2eV and  Kn=En=13.6z2n2eVFrom these three relations. can see that as n decreases, Kn will increase but En and Un will decrease.
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The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true