Physics · Modern Physics
An electron in a Hydrogen atom jumps from the second Bohr orbit to the ground state and the difference between the energies of the two states is radiated in the form of a photon. This photon strikes a metal plate. If the work function of the material is 4.2 eV, then the stopping potential is: (Energy of electron in n-th orbit is given by En = -13.6/n2 eV)
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