Thursday

July 31, 2014

July 31, 2014

Posted by **John** on Sunday, January 6, 2013 at 2:27pm.

- Chemistry -
**bobpursley**, Sunday, January 6, 2013 at 2:48pmestimate: that is over 2 half lives, guessing 20 percent. The math

amountremaining=original*e^(-ln2*15/6.42)

decimal percent=e^(-ln2*15/6.42)=.199

or 19.9 percent

- Chemistry -
**John**, Sunday, January 6, 2013 at 5:47pmThanks

**Related Questions**

math - An unknown radioactive element decays into non-radioactive substances. In...

Calculus-Modeling Equations - An unknown radioactive element decays into non-...

physics - The half life of a radioactive sample is 6.93 days.after how many days...

calc - The half-life of polonium is 139 days, but your sample will not be useful...

math - You have just isolated a new radioactive element. If you can determine ...

Physical Science- Help Please! - Suppose that you are given a 100 gram sample of...

chemistry - How do you find the half-life of an element? Please explain and show...

Gen Chem - Neptunium-239 has a half-life of 2.35 days. How many days must elapse...

chemistry - The disintegration of a radioisotope, such as I-131 to Xe-131, is ...

chemistry - The half-life for the radioactive decay of calcium-47 is 4.5 days.If...