An electron ina hydrogen atom undergoes ...

An electron ina 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 `( V_(i))/( V_(f)) = 6.25`, then the smallest possible `n_(f ) ` is

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