Hint The Bohr model of the atom is the picture that everyone learns in high school. Each allowed orbit has an energy associated with it. The energy of the electron is greater when the radius is greater. Electrons do not radiate energy when they stay in the same orbit.
Electrons radiate or absorb energy when they change orbits.
If an electron jumps from a higher energy orbit to a lower energy orbit, it radiates one photon with an energy corresponding to the energy lost by the electron. When an electron absorbs energy, it jump from a lower energy orbit to a higher energy orbit. The energy of the absorbed photon is precisely the amount of energy gained by the electron. Go back .