Question

When the electron of 5th orbit jumps into the second orbit, the number of spectral lines produced in hydrogen spectrum is:

• A. 5
• B. 6
• C. 10
• D. 20

Answer 1

The correct option is B 6

When electron jumps from 5th orbit to 2nd then following spectral lines produced

$1.5\to 2$ transition

$2.5\to 3$ transition

$3.5\to 4$ transition

$4.4\to 2$ transition

$5.4\to 3$ transition

$6.3\to 2$ transition

So there are 6 spectral lines are produced