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Unformatted text preview: r . 3. Find the quantity left after 100 days. 4. Determine the number of days after which exactly half the original amount would be left. 1 Key 1. Q = 100 ert where r = 0 . 008338160894 2. r = ln (0 . 92)10 = 0 . 008338160894 3. Alternate formula Q = 100(0 . 92)t 10 , so 100(0 . 92) 100 / 10 = 43 . 43884542 4. 10 ln (1 / 2) /ln (0 . 92) = 83 . 12950416. 2...
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 Fall '09
 EdrayGoins
 Radioactive Decay, certain radioactive material

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