This is usually detected by observing effects that they produce in matter and when encountering an atom, such as the photoelectric effect and the Compton effect.
In the strictest sense, this term is applicable only to photons produced as a result of transitions in atomic nuclei. This is usually detected by observing effects that they produce in matter and when encountering an atom, such as the photoelectric effect and the Compton effect. For 10 points, name this type of radiation, occurring when a photon is emitted from an atomic nucleus undergoing a transition to a  lower energy level.
In the strictest sense, this term is applicable only to photons produced as a result of transitions in atomic nuclei.
{Gamma ray} or {Gamma radiation}