An alpha particle undergoes inelastic scattering by a C-12 nucleus at an angle of 60◦. What fraction of the kinetic energy is lost by the α particle?
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- The isotope of Nickel, 66Ni decays by β emission, has a half-life of 2.3 days. and the β particles have an average energy of 65 keV. A source consisting of this isotope has an initial number of atoms N0 = 5 x 1020 atoms. What is the power per unit area initially deposited by this source in a small target placed at 1m distance from the source?Suppose a cube has a mass of 1.4 kg and the density of nuclear matter (which you can assume is 2.3 × 1017 kg/m3).Randomized Variablesm = 1.4 kg Find the length of a side of such a cube in μm.The isotope of Nickel, 66Ni decays by β emission, has a half-life of 2.3 days. and the β particles have an average energy of 65 keV. A source consisting of this isotope has an initial number of atoms N0 = 5 x 1020 atoms. What is the power per unit area initially deposited by this source in a small target placed at 1m distance from the source?
- Only two stable nuclei have Z>N. (a) What are these nuclei? (b) Why don't more nuclei have Z> N?An unstable nucleus undergoes alpha decay with the release of 5.52 MeV of energy. The combined mass of the parent and daughter nuclei is 452 u. What was the parent nucleus? You can use Appendix D in Krane to identify the parent nucleus.Taking into account the recoil (kinetic energy) of the daughter nucleus, calculate the kinetic energy K(alpha) of the alpha particle in the following decay of a 238U nucleus at rest. 238U⟶234Th+alpha K(alpha) = ? MeV
- A radioactive sample contains 3.50 g of pure "C, which has a half-life of 20.4 min. (a) How many moles of "C are present initially? (b) Determine the number of nuclei present initially. What is the activity of the sample (c) initially and (d) after 8.00 h?98/43Tc decays by emitting a 140 keV gamma ray—a highenergy photon. The mass of the nucleus is approximately 98 u. By what fraction does the mass of the nucleus decrease when the gamma ray is emitted?The radioactive nuclide 199Pt has a half-life of 30.8 minutes. A sample is prepared that has an initial activity of 7.56 *1011 Bq. (a) How many 199Pt nuclei are initially present in the sample? (b) How many are present after 30.8 minutes? What is the activity at this time? (c) Repeat part (b) for a time 92.4 minutes after the sample is first prepared.
- At t = 0 s, you have a pure sample of an unknown substance. At t = 948 s, 36.8% of the substance remains. Determine the decay constant and what t will be when 12% of the substance remains. λ = s1 t=At t = 0 we begin to observe two identical radioactive nuclei that have a half-life of 5 min. At t = 1 min, one of the nuclei decays. Does that event increase or decrease the chance that the second nucleus will decay in the next 4 min, or is there no effect on the second nucleus? (Are the events cause and effect, or random?)The half-life of a radioactive material is 1.0 year. There are No such nuclei at time t = 0. (a) What is the probability per unit time for a nucleus to decay? (b) How many parent nuclei are left (haven't yet decayed) at t = 1.5 years? (c) How many parent nuclei are left (haven't yet decayed) at t = 2.0 years?