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Name: The lead isotope Pb-209 decays at a rate proportional to the amount present at time t and has a lifetimeaverage of 3.3 hours. If at the beginning there was a gram of leadHow long…
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The lead isotope Pb-209 decays at a rate proportional to the amount present at time t and has a lifetime
average of 3.3 hours. If at the beginning there was a gram of lead
How long must it take for it to decay by 90%?

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The lead isotope Pb-209 decays at a rate proportional to the amount present at time t and has a lifetimeaverage of 3.3 hours. If at the beginning there was a gram of leadHow long must it take for it to decay by 90%?