The radioactive isotope lead has a half-life of 3.3 hours and decays at a rate proportionate to the amount present at time t. How long will it take for 90 percent of lead to decay if 1 gram of the isotope is present at the start?

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter2: Exponential, Logarithmic, And Trigonometric Functions
Section2.3: Applications: Growth And Decay
Problem 4E
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The radioactive isotope lead has a half-life of 3.3 hours and decays at a rate proportionate to
the amount present at time t. How long will it take for 90 percent of lead to decay if 1 gram
of the isotope is present at the start?

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