Q. Hydrogen atom excites energy level from fundamental state to $n = 3$. Number of spectrum lines, according to Bohr, is
A) 4
B) 3
C) 1
D) 2
Explanation
(b) Number of spectral lines $= \frac{n(n - 1)}{2} = \frac{3(3 - 1)}{2} = 3$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.