Atoms And Nuclei Question 115

Question: The ratio of the wavelengths for 2 ® 1 transition in Li++, He+ and H is [UPSEAT 2003]

Options:

A) 1 : 2 : 3

B) 1 : 4 : 9

C) 4 : 9 : 36

D) 3 : 2 : 1

Show Answer

Answer:

Correct Answer: C

Solution:

$ \frac{1}{\lambda }=RZ^{2}( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} )\Rightarrow \lambda \propto \frac{1}{Z^{2}} $ $ {\lambda_{L{{i}^{++}}}}:{\lambda_{H{{e}^{+}}}}:{\lambda_{H}}=4:9:36 $



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