For the hydrogen atom, the radii of the first two excited states (in terms of the Bohr radius) are

Question

Quizplus · Accepted Answer

The radii of the orbits in a hydrogen atom, according to the Bohr model, are given by $r_n = n^2 a_0$, where $n$ is the principal quantum number (1 for the ground state, 2, 3, ... for excited states) and $a_0$ is the Bohr radius. For the first two excited states, $n = 2$ and $n = 3$, so the radii are $2^2 a_0 = 4a_0$ and $3^2 a_0 = 9a_0$, respectively.

For the Hydrogen Atom, the Radii of the First Two