# A given photosensitive surface is being irradiated by a monochromatic radiation of wavelength λ.

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A given photosensitive surface is being irradiated by a monochromatic radiation of wavelength λ. The stopping potential, needed in this set up, is VS

The deBroglie wavelength, associated with a beam of electrons, accelerated through a potential V, equals the threshold wavelength for the above given photosensitive surface. The relation, between VS and V, is then

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Correct option :  (4)

Explanation :

Let W be the work function for the given photosensitive surface. We then have hc/λ = eVs + W

If λ0 be the threshold wavelength, for the given photosensitive surface, we have

Also, the deBroglie wavelength, λB, associated with the electron beam, is given by