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Physics Index 4 back

Physics Index 4 back - Electrical Current Nuclear Size...

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Electrical Current Nuclear Size •I(charge)=ΔQ/Δt=(ρΔV/Δt)=ρAv=nqAv •dose in rem=dose in rad•RBE (ρ:charge density,q:charge, n:#ions/volume) •E B ( Binding Energy ):total energy of Z protons and N neutrons – total energy of the nucleus •ΔV=V in -V out =(-kBT/Ze)ln(c in /c out ) mass of proton=1.0072765u, mass of neutron=1.0086649u, 1u=1.660539x10 -27 kg=931.494MeV •I=V/R Find total mass Z protons and N neutrons[(=Z•1.0072765u + N•1.0086649u) – mass of nucleus](931.494) •The conventional direction of I us in the direction of the positive •E 0 ( energy )=mc 2 charge flow A Z X (A=# nucleons Z+A=neutrons, Z=# of protons, X=Z) •Electron=random movement= good conductor drift velocity↑ •1 curie=3.7x10 10 decay/second=Becquerel (Bq)=1decay/second because it doesn’t bump into thing as often •N(t)( number of nuclei remaining )=N 0 e -λt •Big wires carry a lot of electric flow, but low resistance •N(t)( number of nuclei remaining )=N 0 e -0.693t/T ½ =N 0 t/T ½ •Resistance is inversely proportional to electric flow •T ½ ( Half life )=ln(2)/λ= 0.693/ λ
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