A) 1 : 2
B) 2 : 1
C) 1 : 4
D) 4 : 1
Correct Answer: B
Solution :
Work function of a substance is given by \[W=\frac{hc}{{{\lambda }_{0}}}\] \[\therefore \] \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{{{\lambda }_{02}}}{{{\lambda }_{01}}}\] 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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