Question

In Balmer series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electrons for Bohr's orbits in an atom of hydrogen?

Answer 1

The line at red end suggests that

First line in Balmer series $n=3$ to $n=2$.

Second line in Balmer series $n=4$ to $n=2$.

Third line in Balmer series $n=5$ to $n=2$.

Electrons jump from $n=5$ to $n=2$ .