Q. Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 Å. Number of spectral lines in the resulting spectrum emitted will be :
A) 3
B) 2
C) 6
D) 10
Explanation
[Solution] E = 12400/975 ≈ 12.75 eV, which takes the electron from n = 1 to n = 4; lines = $\frac{4 \times 3}{2} = 6$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.