A) Copper
B) Sodium
C) Both
D) Neither of them
Correct Answer: B
Solution :
Threshold wavelength for Na, \[{{\lambda }_{Na}}=\frac{12375}{2}=6187.5{\AA}\] Also \[{{\lambda }_{Cu}}=\frac{12375}{4}=3093.75\] Since \[{{\lambda }_{Na}}>4000{\AA}\]; So Na is suitable.You need to login to perform this action.
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