An electron in hydrogen undergoes |Physics|JEE Advance 2017

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JEE Advance 2017

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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

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