Hydrogen atom absorbs radiations of wavelength `lambda_0` and consequently emit radiations of 6 different wavelengths, of which two wavelengths are longer than `lambda_0`. Chosses the correct alternative(s).

Options

A. the final excited state of the atoms is `n = 4`
B. the initial state of the atoms may be `n = 2`
C. the initial state of the atoms may be `n = 3`
D. there are three transitions belonging to Lyman series

Answer

A, B, D

Explanation

`n (n - 1)/(2) = 6 implies n = 4`

if the initial state were `n = 3`, in the emission spectrum, no wavelength shorter than `lambda_(0)` would have occurred.
This is possible if initial state were`n = 2`.