A) 1 : 2
B) 2 : 1
C) 4 : 1
D) 1 : 4
Correct Answer: B
Solution :
Work function is given by \[\text{o }\!\!|\!\!\text{ }\,\text{=}\frac{hc}{\lambda }\]or \[\text{o }\!\!|\!\!\text{ }\,\propto \frac{1}{\lambda }\] \[\because \] \[\frac{\text{o }\!\!|\!\!\text{ }{{\,}_{1}}}{\text{o }\!\!|\!\!\text{ }{{\,}_{2}}}=\frac{{{\lambda }_{2}}}{{{\lambda }_{1}}}=\frac{600}{300}=\frac{2}{1}\]
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