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A metal of work function 4eV is cexposed...

A metal of work function `4eV` is cexposed to a radiation of wavelegth `140xx10^(-9)m`. Find the stopping potential.

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The correct Answer is:
3
`E=(hc)/(lambda)E=(6.62xx10^(-34)xx3xx10^(8))/(140xx10^(-9)xx1.6xx10^(-19))eV`
=8.86eV
Work function `W_(0) = 4eV`
`eV_(0)=E-W_(0)=8.86-4=4.86eV`
`therefore` Stopping potential `V_(0) = 4.86V`
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