1. [-/1 Points] DETAILS OSCOLPHYS2016 31.5.WA.021.TUTORIAL. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The activity of a sample of a radioisotope at some time is 10.5 mCi and 0.34 h later it is 7.00 mCi. Determine the following. (a) Decay constant (in s-1) s -1 (b) Half-life (in h) h (c) Nuclei in the sample when the activity was 10.5 mci nuclei (d) Activity (in mci) of the sample 2.50 h after the time when it was 10.5 mci mci (129 Tutorial Additional Materials Reading2. [-l1 Points] DETAILS OSCOLPHYSZO16 31.5.WA.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The isotope 21A| has a half-life of 2.24 min. Determine the time interval (in min) required for the activity of a sample of this isotope to decrease to 33.0% of its original value. E min Additional Materials D Reading 3. [-/1 Points] DETAILS OSCOLPHYS2016 31.5.WA.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Determine the half-life (in s) of a radioactive sample that has a decay rate of 4.70 x 10 Bq when it contains 2.30 x 1013 nuclei. S Additional Materials Reading4. [-/1 Points] DETAILS OSCOLPHYSZO16 31 .6.WA.O32. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) For the nuclei :Li and 28e, determine the difference in binding energy per nucleon (in MeV). (Let the mass of a proton be 1.0078 u, the mass of a neutron be 1.0087 u, the mass of :Li be 7.0160 u, and the mass of :Be be 7.0169 u.) MeV (b) This difference in binding energy is due to which of the following? 0 Greater proton attraction for the :Be nucleus 0 Greater neutron repulsion for the :Be nucleus 0 Greater neutron attraction for the :Be nucleus 0 Greater electron repulsion for the ZBe atom 0 Greater proton repulsion for the :Be nucleus 0 Greater electron attraction for the :Be atom Additional Materials L] Reading 5. [/1 Points] DETAILS OSCOLPHYSZO16 31 .6.WA.035. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Determine the minimum energy (in MeV) needed to remove just one proton from the nucleus 1:0. (Let the mass of a proton be 1.0078 u, the mass of 1:0 be 15.9949 u, and the mass of 1:N be 15.0001 u.) Additional Materials I: Reading