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Monochromatic radiation of wave length 640.2 nm from a neon lamp irridate a photosensitive material made of tungsten. The stopping voltage is found to be 0.541. The source is replaced by an iron source and its 427.2 nm lines irridate the same photocell. What is the stopping potential now? (Work function for iron is 2.236 eV)

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We have 

= 1.55 V

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