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8 January, 04:43

Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 276 days? How much polonium is in the sample 276 days later?

2; 6.5 g

3; 3.25 g

2; 1,794 g

2; 13 g

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Answers (1)
  1. 8 January, 06:09
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    276/138=2 halflives

    after 1st halflife, 26/2=13 g is left

    after 2nd half life, 13/2 = 6.5 g is left
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