JEE (Advanced) 2017 Paper-1 Question 9

Question 9

An electron in a hydrogen atom undergoes a transition from an orbit with quantum number $$n_i$$ to another with quantum number $$n_f$$. $$V_i$$ and $$V_f$$ are respectively the initial and final potential energies of the electron. If $$\frac{V_i}{V_f} = 6.25$$, then the smallest possible $$n_f$$ is

Correct Answer: 5

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