Non PHYS 2020
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Popular in Physics (Mtsu And Rodp)
This 1 page Class Notes was uploaded by Gilda Wisozk on Wednesday September 23, 2015. The Class Notes belongs to PHYS 2020 at Middle Tennessee State University taught by Charles Higgins in Fall. Since its upload, it has received 25 views. For similar materials see /class/213131/phys-2020-middle-tennessee-state-university in Physics (Mtsu And Rodp) at Middle Tennessee State University.
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Date Created: 09/23/15
Modern Physics Intro to Nuclear Physics 0 The spherical probability density electron cloud ofa groundstate hydrogen atom is roughly 05 x 103910 m 0 An electron is 2000 times smaller than a hydrogen nucleus which is generally on the order of 10 15 m o Protons have a charge that is negative that of the charge on electrons 16 x 10 19 C 0 Mass Number A is equal to the number of nucleons protons plus neutrons in an atom o The atomic number of a nucleus 2 is the number of proton charges in the nucleus 0 The number of neutrons N is equal to A Z 0 The atomic mass unit u can be multiplied to the atomic mass to get an approximate mass ofan atom s nucleus Its value is u 1 6605404 X 10 27kg o Avogadro s number is 602 x 1023 o The masses of protons and neutrons are as follows m1 16726231 X 10 27 8L mu 1674928681 X 10 27 0 Mass can be converted into an equivalent amount ofenergy related to E mc2 o The difference between the expected mass and the actual mass of an atom the mass defect u can be calculated with u Zmp A Zmn M o The binding energy BE is equal to the energy equivalent of the mass defect BE 162 o The speed of light needs to be known to greater significant figures 6 299 792458 o 1 eV 160217733 X 10 19 o The total atomic number before the reaction must be the same as after the reaction conservation of charge 0 The total mass number before the reaction must be the same as the total mass number after the reaction conservation of nucleon number 0 An alpha ot particle is simply a Helium nucleus two protons and two neutrons o A beta B particle is simply an electron o A gamma y particle is simply a highenergy photon emitted by a nucleus 0 Nt N097 where Nt is the number of radioactive parent isotopes in a given sample at time t and No is the number of radioactive parent isotopes present when time equals zero in this case is a constant called the decay constant with units of ls o The activity A of a radioactive sample is defined by A AN 0 The MKS unit ofactivity is the Becguerel Bq 1 Bq 1 1 o 1 Ci 3 7 XX 1010 where a Ci is known as a curie and is a nonMKS unit o At Amt may Aoe h