Wednesday

July 23, 2014

July 23, 2014

Posted by **Billy** on Tuesday, June 5, 2012 at 3:46am.

- Math -
**drwls**, Tuesday, June 5, 2012 at 3:57amYou are talking about a radioactive substance-- one that emits radiation-- NOT a radio.

The annual decay rate is what you multiply the number of radioactive atoms by to get the decay rate, k, in atoms per year.

See http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/halfli2.html

The decay rate is 0.693 divided by the half life, or 0.0693 yr^-1 in this case.

**Related Questions**

Science - Radioactive substance decays so that after t years, the amount ...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

calculus - Carbon-14 is a radioactive substance produced in the Earth's ...

Math - D.E.Q. - The half-life of a radioactive isotope is the amount of time it ...

Math - A radioactive substance decays according to the formula Q(t) = Q0e−...

Math - A radioactive substance decays according to the formula Q(t) = Q0e−...

calculus - The rate at which an amount of a radioactive substance decays is ...

Calculus - The half life of a certain radioactive substance is 10 years. How ...

math - if the rate for radioactive decay for a substance is r=-.0063 and time is...

Math - Suppose a quantity is halvd every 18 years. use the approximate half-...