Radium - $226$ Has a Half-Life Of $1600 \text { years }$

question 50

Essay

Radium - $226$ has a half-life of $1600 \text { years }$ . Suppose we have a $300 \mathrm {~g}$ sample.
(a) Find a formula for the mass remaining after ${ t }$ years
b) How much of the sample remains after $200$ years?
c) After how long will only $20 \mathrm {~g}$ remain?

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