Q. Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be
A) 2
B) 3
C) 5
D) 6
Explanation
(d) If $n = 4$
Lines $= \frac{n(n - 1)}{2} = 6$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.