Question

A transition of electron from an higher orbit to $2^{nd}$ orbit produces $10$ spectral lines. The higher orbit no. is :

• A. seven
• B. eight
• C. six
• D. five

Answer 1

The correct option is C six

A transition of electron from an higher orbit to $2^{nd}$ orbit produces $10$ spectral lines. The higher orbit no. is 6. The spectral lines are obtained due to following transitions.
$6\to 5$
$6\to 4$
$6\to 3$
$6\to 2$
$5\to 4$
$5\to 3$
$5\to 2$
$4\to 3$
$4\to 2$
$3\to 2$