Q.

When a hydrogen atom is raised from the ground state to an excited state

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a

P.E. increases and K.E. decreases

b

P.E. decreases and K.E. increases

c

Both kinetic energy and potential energy increase

d

Both K.E. and P.E. decrease

answer is A.

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Detailed Solution

P.E∝-1r and K.E.  ∝1rAs r increases so K.E. decreases but P.E. increases.
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When a hydrogen atom is raised from the ground state to an excited state