Posted by **Christine** on Monday, October 17, 2011 at 8:32pm.

After 5 days, a particular radioactive substance decays to 37% of its original amount. Find the half life of this substance.

Is this right?

Th= ln 2/ln(1/.37) x 5 days

- Math/Calculus -
**Reiny**, Monday, October 17, 2011 at 9:00pm
Yes, I also got 3.48

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