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Learning Goal: Radioactive decay - Half-life Part - The initial sample is 5.0 kg. What is the mass of the radioactive material that remains after 4.50 years ? 1000 N. Keep 3 digits after the decimal point. SF28F1TB . 100 500 ΨΗ ΑΣΦ και + ? 250 kg masa remains - 0.77 M. A radioactive sample's half-life is 30.2 years. 1 year - 365 days, 1 day 24 hours, 1 hour - 60 min 1 min = 60 Submit Previous Anse Beauet Answer - * Incorrect; Try Again: 5 attempts remaining Part D. in Part C. What is the mass of the radioactive material that has decayed in 4.50 years? Koep 3 digits after the decimal point. θα ΑΣΦ th 2
Part D - in Part C, What is the mass of the radioactive material that has decayed in 4.50 years? Keep 3 digits after the decimal point. V ΑΣφ ? ? mass decayed = kg Submit Request Answer 1 Part E - New case: The initial sample has No = 8.9x1070 radioactive nuclei. What is the initial activity in decays/s (Bq)? Keep 2 digits after the decimal point. Η ΑΣΦ ? ? Bq Ro = Submit Request Answer
I Review Part F- New case: The initial sample has No = 8.9x1010 radioactive nuclei. What is the number of radioactive nuclei that remain after 4.50 years? Use scientific notations, format 1.234*10". V 响 ΑΣφ BUD ? N= Submit Request Answer Part G - New case: After 4.50 years what is the activity in decays/s (Bq)? Keep 2 digits after the decimal point. ΟΙ ΑΣφ ? Bq R= Submit Request Answer