An Electron and a Positron (Antielectron), Both Nearly at Rest

question 23

Multiple Choice

An electron and a positron (antielectron) , both nearly at rest, collide. What particle(s) is(are) produced?

• A) One photon of energy 1.02 MeV
• B) Two photons of energy 511 keV
• C) A pi-meson
• D) A K-meson and an anti-neutrino

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