Sunday

December 28, 2014

December 28, 2014

Posted by **Bree** on Tuesday, December 21, 2010 at 6:59pm.

- Science -
**Damon**, Tuesday, December 21, 2010 at 9:01pm1/2 = e^-5k

ln .5 = -5 k

k = .1386

so

x = Xo e^-.1386 t

.001 = e^-.1386 t

-6.91 = -.1386 t

t = 49.8 days

check

about 10 five day periods

.5^10 = .000976

close enough to .001

**Answer this Question**

**Related Questions**

Science - If a radioactive isotope has half life of 5 days,how long will it take...

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

Science - Radiation - A radioactive isotope, used in the agricultural industry ...

Chemistry - If a 100.0 gram sample of a radioactive isotope goes through three ...

Algebra - Two different radioactive isotopes decay to 10% of their respective ...

Algebra 2 help... - A half life of a certain radioactive is 36 days. An initial ...

Chemistry - How many half lives will it take for a sample of a radioactive ...

chemistry - A radioactive sample contains 2.45 g of an isotope with a half-life...

Chemistry - Gallium65, a radioactive isotope of gallium, decays by first order-...

chem - How long does it take for 10.0 g of a radioactive isotope to decay to 1....