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Monochromatic light of wavelength 198 nm...

Monochromatic light of wavelength 198 nm is incident on the surface of a metallic cathode whose work function is 2-5 eV. How muchpotential difference must be applied between the cathode and the anode of a photocell to just stop the photo current from flowing? 

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From the given relation `eV=(hc)/(lambda)-phi` calculate the required physical terms.
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