Absorption and Re-emission of light in an atom

[nikhil padavala]

Please explain me
1. How Absorption and Re-emission happens in an atom
2. A common explanation that has been provided is that a photon moving through the material still moves at the speed of c, but when it encounters the atom of the material, it is absorbed by the atom via an atomic transition. After a very slight delay, a photon is then re-emitted. This explanation is incorrect and inconsistent with empirical observations.is this statement correct?
3.Photons are absorbed and emitted by electrons excitation or because of phonons? Please Explain me?

 

[DrClaude]

See the FAQ https://www.physicsforums.com/threads/do-photons-move-slower-in-a-solid-medium.511177/