Which among the three causes the least biological damage externally?
In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are 1224Mg (23.98504u), 1225Mg (24.98584u) and 1226Mg (25.98259u). The natural abundance of 1224Mg is 78.99% by mass. Calculate the abundances of other two isotopes.
Obtain the binding energy of the nuclei 2656Fe and 83209Bi in units of MeV from the following data:
Consider the DT reaction (deuteriumtritium fusion).
(a) Calculate the energy released in MeV in this reaction from the data:
(b) Consider the radius of both deuterium and tritium to be approximately 2.0 fm. What is the kinetic energy needed to overcome the coulomb repulsion between the two nuclei? To what temperature must the gas be heated to initiate the reaction? (Hint: Kinetic energy required for one fusion event =average thermal kinetic energy available with the interacting particles = 2(3kT/2); k = Boltzmans constant, T = absolute temperature.)
The rest mass of an electron as well so that of positron is 0.51 cMeV. When an electron and positron are annihilate they produce gamma-rays of wavelength(s)