A) \[1:2\]
B) \[2:1\]
C) \[1:4\]
D) \[4:1\]
Correct Answer: B
Solution :
Work function of a substance Is given by \[W=\frac{hc}{{{\lambda }_{o}}}\] \[\therefore \] \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{{{\lambda }_{02}}}{{{\lambda }_{01}}}\] or \[\frac{{{\lambda }_{01}}}{{{\lambda }_{02}}}=\frac{{{W}_{2}}}{{{W}_{1}}}\] or \[\frac{{{\lambda }_{01}}}{{{\lambda }_{02}}}=\frac{4.5}{2.3}=\frac{2}{1}=2:1\]
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