A) \[1:2\]
B) \[4:1\]
C) \[2:1\]
D) \[1:4\]
Correct Answer: C
Solution :
Work function \[W=\frac{hc}{\lambda }\] (here, they are interested in asking threshold wavelength) where, \[h=\] Planck's constant, \[c=\] velocity of light. Therefore, \[\frac{{{W}_{Na}}}{{{W}_{Cu}}}=\frac{{{\lambda }_{Cu}}}{{{\lambda }_{Na}}}\] \[\frac{{{\lambda }_{Na}}}{{{\lambda }_{Cu}}}=\frac{{{W}_{Cu}}}{{{W}_{Na}}}=\frac{4.5}{2.3}=2\] (nearly)
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