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A radioactive substance decays exponentially. A scientist begins with 140 milligrams of a radioactive substance. After 21 hours...Question
A radioactive substance decays exponentially. A scientist begins with 130 milligrams of a radioactive substance. After 20 hours, 65 mg of the substance remains. How many milligrams will remain after 24 hours?
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R_scott
half of the substance remains after 20 hours ... so that is the half-life
after 24 hr ... amount = 130 * (1/2)^(24 / 20)
after 24 hr ... amount = 130 * (1/2)^(24 / 20)