Physics - Modern Physics Question with Solution | TestHub

Hydrogen (₁H¹), Deuterium (₁H²), singly ionised Helium (₂He⁴)⁺and doubly ionised lithium (₃Li⁶)⁺⁺all have one electron around the nucleus. Consider an electron transition from$n=2$to$n=1$. If the wave lengths of emitted radiation are${\lambda }_1\text{, }{\lambda }_2\text{, }{\lambda }_3$and${\lambda }_4$respectively then approximately which one of the following is correct ?