The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remain after 9.50 years?

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The remaining amount of a radioactive substance can be calculated using the formula: N = N0 * (1/2)^(t/T), where N0 is the initial amount, t is the elapsed time, and T is the half-life. For cobalt-60, N0 = 2.000 mg, t = 9.50 years, and T = 5.20 years. Plugging in these values, N = 2.000 * (1/2)^(9.50/5.20) = 0.565 mg.

The Half-Life of Cobalt-60 Is 5