Question

In Bohr series of the hydrogen spectrum, the third line from the red end corresponds to which of the following inter-orbit jumps of the electron?

• A. n = $5\to n=2$
• B. n = $4\to n=1$
• C. n = $2\to n=5$
• D. n = $3\to n=2$

Answer 1

The correct option is A n = $5\to n=2$

The lines falling in the visible region comprise Balmer series. Hence, the third line from red would be $n_1=2$
$n_2=5,i.e.5\to 2$