How does the energy of a photon emitted when the electron moves from the 3rd orbital to the 2nd orbital compare to the energy of a photon absorbed when the electron moves from the 2nd orbital to the 3rd orbital?

Answer with Explanation:

Energy of orbital

Substitute the values

J

Energy of a photon emitted when the electron moves from the 3rd orbital to the 2nd orbital=

The energy of a photon absorbed when the electron moves from the 2nd orbital to the 3rd orbital=

The energy of a photon absorbed when the electron moves from the 2nd orbital to the 3rd orbital=

Therefore, in both process the energy of absorbed photon and emitted photon are same but the process are complementary to each other.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.