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The stopping potential for photoelectron...

The stopping potential for photoelectrons from a metal surface is `V_(1)` when monochromatic light of frequency `upsilon_(1)` is incident on it. The stopping potential becomes `V_(2)` when monochromatic light of another frequency is incident on the same metal surface. If h be the Planck’s constant and e be the charge of an electron, then the frequency of light in the second case is:

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