How long does it take for 60.0 percent of a sample of radon to decay
1−AA0=2−tT,1-\frac A{A_0}=2^{-\frac tT},1−A0A=2−Tt,
t=−Tlog2(1−AA0)=5.05d.t=-T\log_2(1-\frac A{A_0})=5.05^d.t=−Tlog2(1−A0A)=5.05d.
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