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Multiple choice

X has a half life of 12.5 years. If you start with 200 grams of it, approximately how much will remain after 75 years?

  1. 50 g

  2. 25 g

  3. 12.5 g

  4. 3.125 g

  5. 0.781 g

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ending Amount = Beginning Amount / 2(time / half-life) Ending Amount = 200 / 2(75/12.5) Ending Amount = 200 / 2(6) Ending Amount = 200/64 Ending Amount = 3.125g  

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