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6 February, 01:22

Iodine-125 has a half-life of about 60 days.

How many milligrams of a 500 mg sample will remain after 300 days?

1. 0.6 mg

2. 7.8125 mg

3. 15.625 mg

4. 31.25 mg

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Answers (1)
  1. 6 February, 03:51
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    We know that Iodine - 125 has a half life of 60 days.

    300 : 60 = 5. It means that it was halved 6 times.

    Therefore: 500 mg * 0.5^5 =

    = 500 mg * 0.5 * 0.5 * 0.5 * 0.5 * 0.5 =

    = 500 mg * 0.03125 = 15.625 mg

    Answer: 3. 15.625 mg.
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