Q. Which of the following phenomena suggests the presence of electron energy levels in atoms
A) Radio active decay
B) Isotopes
C) Spectral lines
D) $\alpha$-particles scattering
Explanation
The correct answer is Option C: Spectral lines.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.