In Bohr series of lines of hydrogen spectrum, third line from the red end corresponds to which one of the following inner orbit jumps of electron for Bohr orbit in atom in hydrogen :

Options

A. `3 rarr 2`
B. `4 rarr 1`
C. `2 rarr 5`
D. `5 rarr 2`

Answer

D

Explanation

Lines in red portion (visible region) imply that we are dealing with the Balmer series of the `H` atom. According to Bohr's explanation, spectral lines in the Balmer series arise due to the fall of electron from any higher enegry level to `n =2` state. Thus, `n = 3rarr n = 2(1st` line), `n = 4rarr n = 2(2nd` line), `n = 5 rarr = 2(3rd` line).