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The electron in the hydrogen atom jumps fromexcited state (n - 3) to its ground state (n 1) anthe photons thus emitted irradiate a photosensitivematerial. If the work function of the material is 5.1eV, the stopping potential is estimated to be (the13.6energy of the electron in nh state EneV)-(1) 12.1 V (2) 17.2 V (3) 7 V (4) 5.1 V

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