Here are the answers for the attached question: (a) 2.78 x 10–11 J/fission; (b) 7.13 x 104 MJ/g of 235U; Can you please show me how you calculated the question in the attachment? I am getting different answers than the ones provided.

Cow's milk produced near nuclear reactors can be tested for as little as 1.00 pCi of  I per liter, to check for possible reactor leakage. What mass of  I has this activity? (answer in ×10 g)

α decay producing 228R . The parent nuclide is nearly 100% of the natural element and is found in gas lantern mantles and in metal alloys used in jets (228Ra is also radioactive).

1) If the activity of a purely radioactive sample of 55Fe is measured to be 0.5 mCi. What is the number of nuclei of this isotope present after 5.4 years. 2) 226Ra (t₁/2 = 1600 y) alpha decays to the 1st excited state of nucleus X with branching ratio 6% and alpha decays to the ground state of X with branching ratio 94%. Calculate the partial half-life for the first mode transition (the one to the first excited state of X). 3) Fill the missing and decide the type of decay in the following decays: a) Co* → [ ] + Co b) ¹50 [ ] + [ ] + ¹5N 40 c) 10K + [ ] 18Ar d) 21 Po 84 e) ¹3 Be →>> 2a + [ ] ¹2Be + [ ]

(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. 94

239 239Pu can be bombarded by a neutron and undergo nuclear fission to make an atom of 204 Au and an atom of 3lp. Write the balanced nuclear equation for the process. Make sure to show how many neutrons are given off by this reaction. Include the FULL isotope notation for ALL species involved.