A) \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-16}}}\text{J}\]
B) \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-19}}}\text{J}\]
C) \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-20}}}\text{J}\]
D) \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-22}}}\text{J}\]
Correct Answer: B
Solution :
The work function \[W=\frac{hc}{\lambda }\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{600\times {{10}^{-9}}}\] \[W=3\times {{10}^{-19}}\](approximately)
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