Unformatted text preview: t ≈ 9.2 hours 3. A radioactive substance has a halflife of 8 years. a) If 200 grams are present initially, how much will remain at the end of 12 years? A ≈ 70.7grams b) How long will it be until only 10% of the original amount remains? b) t ≈ 26.6 years 4. The Angus Company has a manufacturing process that produces a radioactive waste byproduct with a halflife of twenty years. a) How long must the waste be stored safely to allow it to decay to onequarter of its original mass? 40 years b) How long will it take to decay to 10% of its original mass? 66.4 years c) How long will it take to decay to 1% of its original mass? 132.9 years 5. A bacteria population triples every 5 days. The population is P o bacteria. a) Write an equation that reflects this statement. ( ) 5 3 t o P P = b) If the initial population is 120, what is the population i) after 5 days 360 ii) after 2 weeks 2600...
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 Fall '08
 GERMAN
 Calculus, PreCalculus, Radioactive Decay, original mass

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