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If 250 mg of a radioactive element decays to 200 mg in 48 hours, find the half-life of the element

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amountleft=originalamount*e^-.692t/thalf

200=250 e^-.692*48/thalf

200/250=e^( )

take the ln of each side

-.2231=-.692*48/thalf

solve for half life time.

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