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
2eV
2.2eV
6.2eV
4eV
A
4eV
B
6.2eV
C
2.2eV
D
2eV
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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=hcλ−Wo Eed=hcλ−W
4eV=1240200−Wo Wo=6.2−4=2.2eV
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