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Iodine-125 has a half-life of about 60 days. How many milligrams of a 500 mg sample will remain after 300 days?
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Iodine-125 has a half-life of about 60 days.

How many milligrams of a 500 mg sample will remain after 300 days?

User Waseefakhtar
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2 Answers

3 votes

the answer is 15.625mg

User Otm
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Since it has a half life of 60 days, this means that every 60 days it multiplies by 0.5. Since it asks for 300 days, your equation is 500*(0.5)^5, which is 15.625 mg left after 300 days.
User P Kuijpers
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