(c) $\frac{1}{\lambda} = RZ^{2}\left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}}\ \right) \Rightarrow \lambda \propto \frac{1}{Z^{2}}$ $\lambda_{Li^{+ +}}:\lambda_{He^{+}}:\lambda_{H} = 4:9:36$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.