The phenomenon in which electron and positron are converted into two photons, is called:

Explanation

A.The creation of an elementary particle and its antiparticle, usually when a photon (or another neutral boson) interacts with a nucleus an electron and its antiparticle, the positron, may be created is called pair production B. The scattering of high frequency photon strikes a stationary electron the frequency of the photon is decreased after the collision. This phenomenon is referred to as Compton's effect. C. When an electron(e-) and a positron(e+) collide two gamma-ray photons are produced and the phenomenon is called pair annihilation D. When light hits the metal surface electrons are emitted, the phenomenon is called the photoelectric effect and the electrons emitted are called photo-electrons.