Multiple choice

Starting with 100 grams of a substance P, which has a half life of 91 days. How much time will it take until only 10 grams remain?

  1. 9.1 days

  2. 18.2 days

  3. 27.4 days

  4. 45.5 days

  5. 91 days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Elapsed time = half life x log (beginning amount / ending amount) /log 2 Elapsed time = 91 x [log (100/10) / 0.30103] Elapsed time = 91 x (1/0.30103) Elapsed time = 27.4 days (approx).

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