Learning Goal: Radioactive decay - Half - life Time N 0 1,000,000 1000 500,000 250,000 125,000 750 62,500 31.250 15,625

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Learning Goal Radioactive Decay Half Life Time N 0 1 000 000 1000 500 000 250 000 125 000 750 62 500 31 250 15 625 1 (94.13 KiB) Viewed 47 times

Learning Goal: Radioactive decay - Half - life Time N 0 1,000,000 1000 500,000 250,000 125,000 750 62,500 31.250 15,625 500 7,813 3,906 1,953 250 977 125 Number of nuclides, N X 109 tie 2112 310 4142 5042 6122 7112 82 9142 10012 0 tve 21,2 31,241,251,26tiq 71,2 81,2 912101,2 Time in multiples of 2 A radioactive sample's half-life is 64.8 days. 1 day = 24 hours, 1 hour = 60 min, 1min = 60 s = =

The initial sample is 3.9 kg . Some time after the initial sample was prepared, it was found that 0.2814 kg of the radioactive material has decayed. Part C - What is the mass of the radioactive material that remains in the sample? Keep 3 digits after the decimal point. IVO AED ? kg mass remains = Submit Request Answer Part D - Find the time for Part C, in days. Keep 2 digits after the decimal point. ΤΑΙ ΑΣφ ? days t = Submit Request Answer New case: Another sample Part E - New case: To have an initial activity of Ro = 8047.30 Bq (decays/s), what is the number of radioactive nuclei in the initial sample? Use scientific notations, 1.234*10" ΤΑΙ ΑΣΦ ? No = Submit Request Answer

Part F- New case: After 7.00 days what is the activity in decays/s (Bq)? Keep 2 digits after the decimal point. VO AEO ? Bq R= Submit Request Answer Part G - New case: same sample as in Part E and F. How many days does it take for the activity to reach 6928.08 Bq ? ΟΙ ΑΣφ ? tnew = days Submit Request Answer