Answer to Question #113369 in Physics for Cris

Question #113369

How much of a 32 gram sample of I-131 remains after 48 days ?(half life of I-131 is 8 days )

Expert's answer

The radioactive decay equation says

"m(t)=m_0 2^{-t\/t_{1\/2}}"

Hence, we get

"m=(32\\:\\rm g) 2^{-48\/8}=0.5\\:\\rm g"

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