4. 80Br can undergo all three types of 3 decay (B- decay, B+ decay, and electron capture). (a) Write down the decay equation in each case. (b) Compute the decay energy for each case.
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- The decay constant for 198Au is 2.97 x 10-6 s-1. Suppose we had a 1.00-ug sample of 198Au. What is its activity?A proposed nuclear reactor facility will have an electrical power output of 937 MW with a 36.9% efficiency in converting nuclear to electrical power. Assuming the average fission reaction produces 156 MeV, how many reactions will take place at the facility every second?Glow-in-the-dark signs take advantage of β− particles emitted in the decay of certain isotopes that glow when interacting with matter. If such a sign has an activity of 14.7 Ci when it's manufactured and contain isotopes with a half-life of 13.3 y, what will its activity in Ci be 3.9 y later?
- (a) In addition to uranium, plutonium is also a well-suited starting product for the release of energy through nuclear fission. If you bombard a ²32Pu nucleus with a neutron the fission products 94 barium ¹Ba and strontium 3Sr are formed. 56 (i) Write down the full equation of the reaction. (ii) Calculate the reaction energy in eV units. Note that m(232Pu) = 239.052162u, 94 m(¹Ba) = 143.922955u, and m(Sr) = 93.915356u. (iii) Explain what triggers a chain reaction with 232 Pu. 94A certain particle has a half-life of 179. s. What is the decay constant, in s-1?The decay constant for 198Au is 2.97 x 10-6 s-1. Calculate the half life.