Photon The boson that is the fundamental unit of electromagnetic radiation. The name
given to a small bundle or quantum of electromagnetic energy. It is used when
describing the particle-like behavior of electromagnetic waves
tunneling time. But will the photon traversing the
tunneling path arrive before or after the photon following along the free path? In theory, a superluminal result is possible,
in which the tunneling photon arrives first. Chiao shows why this
the absorption of a photon by the retina ), micro- meso (e.g., the
capture of an electron by an interstellar dust particle), and irreversible
micro-micro (e.g., proton-proton scattering in the presence of heavy nuclei)
interactions,
