Particle Physics Revision Notes

AS Level Physics

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Nucleon

Proton or neutron in the nucleus

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Z = Atomic number

Number of protons in the nucleus

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A = Nucleon number or mass number

Number of protons and neutrons in the nuclueus

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Isotopes

Atoms with the same number of protons and different number of neutrons

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Specific Charge

Charge of particle ÷ mass of particle (Unit Ckg-1)

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Strong Nuclear Force

Range = 3 - 4 fm (approx diametre of a small nucleus)

Acts Between Nucleons

Attractive down the about 0.5 fm

Repulsive at separations smaller than this

Exchange Particles = pi mesons or pions

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