Sunday

September 21, 2014

September 21, 2014

Posted by **ronny** on Wednesday, May 21, 2008 at 5:51am.

- physics -
**drwls**, Wednesday, May 21, 2008 at 6:41amThe fraction (1/6) that remains after 70 years satisfies the relation:

1/6 = 2^(-t/T),

where T is the half life and t = 70 years.

Take logs of both sides to solve for T. I'll use logs to base e but it doesn't matter

-1.7918 = -70/T ln 2 = -48.52/T

T = 27.1 years

**Answer this Question**

**Related Questions**

Science- Radioactive Dating - Which of the following statements about ...

math - 39mg radioactive with 1/2 life is decay total in 2.5 years. How many mg ...

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

chemistry - How long will it take for 25% of the C-14 atoms in a sample of C-14 ...

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

Physics ... - Hi Radioactive decay - A radioactive nuclide has a decay constant...

Physics - Hi Radioactive decay - A radioactive nuclide has a decay constant of...

Geology - If the decay constant for radioactive decay of ^40 K is λ = 5.543...

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

Chem 2 - The half-life for the radioactive decay of U-238 is 4.5 billion years ...