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22 September, 18:33

Strontium-90 has a half-life of about 28 years. After 112 years, how many grams of a 50 g sample will remain?

a. 3.125 g

b. 6.25 g

c. 12.5 g

d. 42.0 g

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  1. 22 September, 18:56
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    112 = 4 * 28 so the factor is (1/2) ^4 = 1/16

    Number of grams remaining = 50 * 1/16 = 3.125

    Its a
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