Polonium-218 has a half life of about 2 days. After 10 days, how many milligrams of a 1200 mg sample will remain?
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R = 1200 x (1/2)^(10/2)
=1200 x (1/2)^5
=1200 x 0.03125
=37.5 mg - will have remained after 10 days.