The half-life of 60CO is 5.27 years. The activity of an 60 Co sample is 2.60x10° Bq. You may want to review (Pages 1221 - 1225) Part A What is the mass of the sample? Express your answer with the appropriate units.

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Constants I Periodic Table (Figure 1) is the graph of binding energy per nuclon. Part A Use the graph to estimate the total energy released if a nucleus with mass number 240 fissions into two nuclei with mass number 120. Express your answer in mega-electron volts to one significant figure. ΑΣφ ? E = MeV Submit Request Answer Figure 1 of 1 Provide Feedback Next > Binding energy (MeV) per nucleon 10- Maximum 8.8 MeV per nucleon 9 8 7 6 5 4 3 1 50 100 150 200 250 Mass number, A

C Exercise 29.23 Part A Calculate the time required for a sample of radioactive tritium to lose 79.0 % of its activity. (Tritium has a half-life of 12.3 years.) V t = 28.6 Submit ΑΣΦ Provide Feedback Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Review your calculations and make sure you round to 3 significant figures in the last step. H ? Q Search years P Pearson W