Excited atoms emit radiations consisting of only certain discrete frequencise or wavelengths. In spectroscopy it is often more convenient to use freuquencies and wave numbers are proportional ot energy and spectroscopy involves transitions between different energy levels . The line spectrum shown by a single electron excited atom (a finger print of an atom) can be given as
`1/(lambda)=barvR_(H).Z^(2)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]`
where Z is atomic number of single electron atom and `n_(1),n_(2)` are integers and if `n_(2)gt n_(1),` then emission spectrum is noticed and if `n_(2)ltn_(1),` then absorption spectrum is noticed.
Every line in spectrum can be represented as a difference of two terms `(R_(H)Z^(2))/(n_(1)^(2)) "and"(R_(H)Z^(2))/(n_(2)^(2)).`
The ratio of wavelength for II line fo Balmer series and I line of Lyman series for H-like species is :

Options

A. 1
B. 2
C. 3
D. 4

Answer

D