a) Energy/mass

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4 Terms

1
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  • the mass-energy equation


  • ΔE = Δmc2

    • change in energy (J) = change in rest mass (kg) × speed of light2 (m2s-2)


2
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  • the implications of the mass-energy equation


  • so energy and mass are equivalent


3
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  • the conservation of mass and energy during radioactive decay


  • a nucleus decays

  • the rest mass of the parent nucleus > the rest mass of the decay products

    • because the parent nucleus transfers energy to the kinetic store of the decay products

    • and energy is mass

  • so the gain in kinetic energy = the loss in rest mass


4
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  • the conservation of mass and energy during electron-positron annihilation


  • the mass of the electron and the positron is converted into energy

  • in the form of two gamma photons

  • and energy is mass