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==Key Stage 4==
===Meaning===
'''Mass-EnergyEquivalence''' is the observation that [[energy]] and [[mass]] together form a conserved quantity in a [[Nuclear Reaction|nuclear reaction]] or [[Radioactive Decay|decay]].
===About Mass-Energy Equivalence===
: [[Mass]] becomes [[energy]] in [[Nuclear Reaction|nuclear reactions]] and [[Radioactive Decay|nuclear decays]].
: When a [[Nuclear Reaction|nuclear reaction]] takes place the [[mass]] of the products is less than the [[mass]] of the reactants as some of the [[mass]] has been converted into [[energy]] and [[Energy Transfer|transferred]] away by [[gamma-ray]]s.
==Key Stage 5==
===Meaning===
'''Mass-Energy Equivalence''' states that [[mass]] is '''equivalent''' to [[energy]] and [[energy]] is '''equivalent''' to [[mass]] related by the equation <math>E=mc^2</math>, and that '''mass-energy''' is a conserved quantity.
===About Mass-Energy Equivalence===
: '''Mass-energy equivalence''' is observed in the [[Fundamental Interaction|interactions]] between [[Subatomic Particle|subatomic particles]].
: [[Proton]]s and [[neutron]]s bound in the [[Atomic Nucleus|nucleus]] have less [[mass]] than free [[proton]]s and free [[neutron]]s as [[energy]] is released when the [[nucleon]]s [[Binding Energy|bind]] together.
: In a [[Particle Accelerator|particle accelerator]], [[Subatomic Particle|particles]] are given so much [[Kinetic Energy Store|kinetic energy]] that when the [[collide]] with [[Subatomic Particle|particles]] travelling the opposite direction much of that [[energy]] can become [[mass]] causing the production of new [[Subatomic Particle|particles]].
: High [[energy]] [[photon]]s ([[Gamma-ray]]s) may have enough [[energy]] to engage in [[Pair Production|pair production]] in which a [[gamma-ray]] becomes a [[Subatomic Particle|particle]]-[[antiparticle]] pair.
===Equation===
<math>E=mc^2</math>
Where
<math>E =</math> The '''rest energy''' of a [[Subatomic Particle|particle]].
<math>m =</math> The '''rest mass''' of a [[Subatomic Particle|particle]].
<math>c =</math> The speed of [[light]] (<math>3.00\times10^{8}ms^{-1}</math> in a [[vacuum]]).