Sunday

February 1, 2015

February 1, 2015

Posted by **Korina** on Saturday, January 29, 2011 at 9:31pm.

Can anyone give me a VERY SIMPLE explanation of this please?

Thank you.

- Science -
**drwls**, Saturday, January 29, 2011 at 11:13pmSolve this equation for the number of days, x:

(0.5)^(x/5) = 1/1000

You can compute x by taking the log of both sides.

x/5 = 9.97

x = 49 days

The words "a maximum of" are not needed in your question. After 49 days, the radioactive strength will be exactly 1/1000 of the original value, except for rounding-off error. You only have one significant figure in the half-life.

**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....