SOLUTION: Scientist made 160mg of radioactive sodium and found that there was only 20mg left 45 hours later. What is the half life of the radioactive sodium?
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Question 1192835: Scientist made 160mg of radioactive sodium and found that there was only 20mg left 45 hours later. What is the half life of the radioactive sodium? Answer by ikleyn(52780) (Show Source):
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Scientist made 160mg of radioactive sodium and found that there was only 20mg left 45 hours later.
What is the half life of the radioactive sodium?
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Notice that the mass ratio "then" and "originally" is
= = .
It means that 45 hours is three half-lives, so the half-life is 45/3 = 15 hours. ANSWER
