Using Bohr model Calculate for the Hydrogen atom: a$)$ The atom$$s diameter for the n$=2$ and n$=3$ excited states, b$)$ The values of the energy levels for n$=2$ and n$=3.$

c$)$ The frequency of the photons emitted form these excited states to the ground state. $($Rydberg Constant equals $1\mathrm{.}097$ x$107$ m$-1)$