Question

In Bohr 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 electron for Bohr orbits in an atom of hydrogen ?

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

Answer 1

Answer: (C)

$2\to 5$

Here, red end means it is a part of the visible region and obviously only Balmer series correspond to the visible region

For Balmer series $n_1=2$

first line from red end 2 $\to$ 3 transition

second line from red end 2 $\to$ 4 transition

third line from red end 2 $\to$ 5 transition