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. `5 rarr 2`
C. `4 rarr 1`
D. `2 rarr 5`

Answer

2

Explanation

The electron has minimum energy in the orbit and its energy increases as `n` increases. Here `n` represents number of orbit, i.e., `1^(st), 2^(nd), 3^(rd)`….. The thired line from the red end corresponds. To yellow region i.e., `5`. In order to obtain less energy electron tends to come `1^(st)` or `2^(nd)` orbit. So jump may be involved either `5 rarr 1` or `5 rarr 2`. Thus option (2) is correct here.