NEET Questions Solved

The electron in the hydrogen atom jumps from excited state n=3 to its ground state n=1 and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in nth state En=13.6n2eV)

(a) 5.1 V                                               (b) 12.1 V

(c) 17.2 V                                              (d) 7 V

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