Pertubation theory — CSIR Net PYQ (Question 1)

A Pertubation theory previous-year question (PYQ) from Quantum Mechanics (CSIR Net). Read the question, check the correct answer, then practise the full topic.

Question 1 of 23 · 5.0 marks

A hydrogen atom is subjected to the perturbation

V_{p er t} (r) =\in cos \frac{2 r}{a _{0}}

where

a_{0}

is the Bohr radius. The change in the ground state energy to first order in

\in

1 $\frac{\in}{4}$
2 $\frac{\in}{2}$
3 $\frac{- ϵ}{2}$
4 $\frac{- ϵ}{4}$

Correct answer: Option 4

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This Pertubation theory PYQ is part of the Quantum Mechanics section of CSIR Net. Browse more Pertubation theory questions or join the PhysicsByAaryan live batch for full conceptual coverage.