question_answer

A doubly ionised Li atom is excited from its ground state (n=1) to n=3 state. The wavelengths of the spectral lines are given by \[{{\lambda }_{32}},{{\lambda }_{31}}\]and\[{{\lambda }_{21}}.\]The ratio \[{{\lambda }_{32}}/{{\lambda }_{31}}\]and\[{{\lambda }_{21}}/{{\lambda }_{31}}\]are, respectively        [JEE ONLINE 12-05-2012]

A) 8.1, 0.67

B) 8.1, 1.2

C) 6.4, 1.2

D) 6.4, 0.67

Correct Answer: C

Solution :

[c] where R = Rydberg constan

t

Similarly solving for and

and

and