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4 Light of wavelength 800 nm is shone on a metal surface connected to a...

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4 Light of wavelength 800 nm is shone on a metal surface connected to a battery The work function of the metal is 1 25 eV Find the extinction voltage or retarding voltage at which the photoelectron current stops Find the highest speed of the emitted photoelectrons at this incident frequency Ans Vr 0 3 volt 3 2 105m s

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