BRAINCAKEAnnihilation
Annihilation occurs when a particle and its corresponding antiparticle meet. Their mass is converted into photons of energy.
E0 = m c2
E0 = rest energy and m = mass
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Key terms in this lesson
- Isotope
- An atom of an element with the same number of protons but a different number of neutrons compared with another atom of the same element.
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
- Antiparticle
- A particle with the same rest mass as its corresponding particle but with opposite charge and opposite values of other quantum properties.
- Positron
- The antiparticle of the electron: it has the same mass as an electron but a positive charge.
- Momentum
- The product of an object's mass and its velocity; a vector quantity, conserved in any interaction provided no external resultant force acts.
More in Particles and Radiation
- Gamma Radiation and Electromagnetic Waves
- The Electron Volt
- Photons
- Anti-matter
- Pair Production
- The Discovery of the Positron
- The Electromagnetic Force
- Feynman Diagrams
All 22 lessons in Particles and Radiation · All AQA AS-level Physics topics