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A metallic surface is irradiated with mo...

A metallic surface is irradiated with monochromatic light of variable wavelength. Above a wavelength of `5000 Å` no photoelectrons are emitted from the surface. With an unknown wavelength, stopping potential fo 3V is necessary ot eliminate the photo current. Find the unknown wavelength.

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Using equation of photoelectronic effect
`K_(max)=E-W (K_(max)=eV_(s))`
`:. 3eV=(12400)/(lambda)-(12400)/(5000)=(12400)/(lambda)-2.48eV`
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