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
Answer This Question
Related Questions
 calculus  The rate at which an amount of a radioactive substance decays is ...
 Math  A radioactive substance decays according to the formula Q(t) = Q0e−...
 Math  A radioactive substance decays according to the formula Q(t) = Q0e−...
 Science  Radioactive substance decays so that after t years, the amount ...
 Algebra  Andrew measures the amount of a very unstable substance to be 100 ...
 algebra  Andrew measures they amount of a very unstable substance to be 100 ...
 Physics  A radioactive substance decays from 2.0kg to 1.6kg in 156 days. What ...
 algebra  A radioactive substance decays according to the formula A=A0e^kt where...
 chemistry  a radioactive substance decays 10% in 5 days. The amount remains ...
 Physics  Suppose a hypothetical radioactive nucleus (Hy) has a halflife of 10 ...
More Related Questions