Using Bohr$$s model for the Hydrogen atom:

a$)$ Find the energy of the ground state and the first $3$ excited states.

b$)$ If the electron is in the ground state, how much energy is required to move into

the first and the third excited states?

c$)$ If the electron is in the ground state, what will happen to the electrons if I shoot

photons of wavelength $\backslash$lambda $=100$nm$?$