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20 In a standard photoelectric emission set up the metal has threshold wavelength 22 where...

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20 In a standard photoelectric emission set up the metal has threshold wavelength 22 where is the wavelength of incident radiation The accelerating potential is such that it increases the kinetic energy of the photoelectrons by 200 before striking the anode The de Brogie wavelength of the fastest electrons before striking anode is h Planks constant m mass of electron c speed of light 1 3 h 2mc 22h 2 4 h 3mc h

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