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Example 4 (a) The work function for the surface of aluminium is 4-2 eV. How much potentialdifference will be required to stop the emission of maximum energy electrons emitted by light of2000 À wavelength ?(b) What will be the wavelength of that incident light for which stopping potential will be zero ?h = 66 x 10-34 Js, c = 3 108 ms-1.

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