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===About Annihilation===
*'''Annihilation''' occurs when [[particle]]s of [[matter]] and [[antimatter]] interact at extremely close range.
*Follows the principle of [[Mass-Energy Equivalence|mass-energy equivalence]] (E=mc²).*Results in the production of [[Gamma-ray|gamma rays]] or other [[Subatomic Particle|particles]]. However, for a-level physics, you only need to consider the special case of 2 [[Gamma-ray|gamma ray]] [[photon]]s being [[emit]]ted.*During '''annihilation''' the total [[Rest Mass|rest mass]], as well as the [[Kinetic Energy|kinetic energy]], of the [[particle]]s before the event is equal to the total [[energy]] of the products (two [[Gamma-ray|gamma ray]] [[photon]]sin a-level physics) after the event.
*In '''annihilation''' [[Conservation of Momentum|conservation of momentum]] is conserved due to the [[momentum]] of the [[Gamma-ray|gamma ray]] [[photon]]s travelling in opposite directions.
*For a-level physics you only need to consider the special case of 2 [[Gamma-ray|gamma rayAnnihilation]] [[photon]]s being [[emit]]tedcan occur in high-energy environments such as the vicinity of black holes and in particle accelerators.
===Equation===
<math>E_k</math> = The [[Kinetic Energy|kinetic energy]] of the particle
===Examples===
*[[Positron Emission Tomorgraph|Positron emission tomography]] ([[Positron Emission Tomography|PET]]) scans detect [[Gamma-ray|gamma rays]] from [[electron]]-[[positron]] [[annihilation]].
*[[Particle Accelerator|Particle accelerators]] study [[annihilation]] events to understand [[Fundamental Particle|fundamental particles]].