Chemistry - Atomic Structure Question with Solution | TestHub

A unielectronic ion ${\mathrm{M}}^{+\mathrm{q}}$ has electron in a state ${\mathrm{X}}_1$ that has two spherical nodes and no angular nodes. Energy of state ${\mathrm{X}}_1$ is equal to ground state energy of hydrogen atom. Electron de-excites from ${\mathrm{X}}_1$ to state ${\mathrm{X}}_2$ and velocity of electron in ${\mathrm{X}}_2$ is $\mathrm{a}\times 10^6{\mathrm{ms}}^{-1}$. State ${\mathrm{X}}_2$ has one angular node and zero radial node. What is the value of $\mathbf{a}$ after adjusting to first decimal place?