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Question

All electron ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of uniform electric field of 4N/C. The work function of the surface is
  1. 2eV
  2. 2.2eV
  3. 6.2eV
  4. 4eV

A
4eV
B
6.2eV
C
2.2eV
D
2eV
Solution
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The electron ejected with maximum speed vmax are stopped by electric field E after travelling distance d
Work done by electric field =Force×distance=Eed
Photolelectric Law
KEmax=hcλWo
Eed=
hcλW
4eV=1240200Wo
Wo=6.24=2.2eV

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