Q.

Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used, The work function of the metal is

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a

4.5eV

b

5.5eV

c

5eV

d

4eV

answer is B.

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Detailed Solution

From Einstein's Photoelectric Equation,

E= Wo+KE KE= E-  Wo also KE= eVo eVo=hcλ-Wo Wo=hcλ-eVo on plugging the values  Wo=6.626×10-34×3×1082.5×10-7-(1.6×10-19 ×0.5) Wo=4.5Ao   

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