7. If the mass of the products in a fission reaction is 3.2 × 10^28 kg less than the reactants, how much energy is released in the reaction? (A) 3.6 × 10-45 J (C) 9.6 × 10-20 J (B) 1.1 × 10-38 J (D) 2.9 × 10-11 J

Radon gas has a half-life of 3.83 days. If 2.92 g of radon gas is present at time t = 0, what mass of radon will remain after 2.20 days have passed? g

If a fusion process requires an absorption of energy, does the average binding energy per nucleon increase or decrease? 3 Suppose a 238U nucleus “swallows” a neutron and then decays not by fission but by beta-minus decay, in which it emits an electron and a neutrino.Which nuclide remains after this decay: 239Pu, 238Np, 239Np, or 238Pa?

Carbon-14 is naturally rare, but can be produced by the reaction  n + 14N → 14C + p.  How much energy in MeV is released in this neutron capture? (Assume 1 u = 931.5 MeV/c2.)

A uranium-235 nucleus absorbs a neutron and the splits into a bromine-87 nucleus, a lanthanum-146 nucleusand additional neutrons. What is the energy released in the reaction? (Bromine-87 = 86.920711 u, andlanthanum-146 = 145.925791 u)

9 H the mass of the products in a fission reaction is 3.2 x 10^28 kg less than the reactants, how much energy is released in the reaction? (A) 3.6 10 45J (B) 1.1 x 10-38J (C) 9.6 x 10420 J (D) 2.9 x 10-11 J

7. One of the many isotopes used in cancer treatment is 198 Au, with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 225 Ci. mg VJSS f60 ssf ( sf60 ssf

4. What is the energy released/absorbed in this nuclear reaction 4N+H³C + 3He? (The atomic mass of 14 Nis 14.003074 u, and that of 1³C is 13.003355 u) MeV

9. A rock that contains 1.2x10-12 mol of 232Th (t1/2 = 1.4x1010 yr) has 4.2x105 fission tracks, each track representing the fission of one atom of 232Th. How old is the rock?

Complete the following equation for fission by giving the number of neutrons that are produced:  23692U→14257La+9035Br+[]10n