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A monochromatic light source of intensit...

A monochromatic light source of intensity 5 m W emits `(8x10^15)` photons per second . This light ejects photoelectrons from a metal surface. The stopping potential for this setup is 2.0 V. Calculate the work function of the metal.

Text Solution

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`P= 5 X 10^(-3)W`
`E=p/n=6.25 xx 10^(-19)J`
`E=3.8eV`
`W_(0)=E-eV_(0)`
`=(3.9-2)eV_(0)`
`W_(0)=1.8eV`
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