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Question

Calculate the stopping potential Vs2

A
4.47
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B
3.16
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C
2.76
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D
5.28
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Solution

The correct option is C 4.47
Using the Einstein's equation for photoelectric effect:
In first case, eVs1=hcλ1W ....(1) where W= work function of metal surface.

And in second case, eVs2=hcλ2W ....(2)

From (1) and (2), eVs2=hcλ2hcλ1+eVs1=(6.62×1034)(3×108)190×109(6.62×1034)(3×108)550×109+(1.6×1019)(0.19)

=7.152×1019J

or Vs2=7.152×10191.6×1019=4.47V

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