Friday

December 19, 2014

December 19, 2014

Posted by **Rachel** on Saturday, May 18, 2013 at 4:06am.

a)(a) What is the half-life of the element? half-life:

b)How long will it take for a sample of 100 mg to decay to 51 mg?

time needed:

- math -
**Steve**, Saturday, May 18, 2013 at 5:08am.36 = (1/2)^(100/k)

k = 67.84

so, the half-life is 67.84 days

Makes sense, since the sample has decreased by a little more than 1/2 in 100 days.

51/100 = (1/2)^(t/67.84)

t = 65.9 days

**Answer this Question**

**Related Questions**

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

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

Chemistry - A radioactive element has a half-life of 6.41 days. What percent of ...

Pre calc - If 250 mg of a radioactive element decays to 200 mg in 48 hours, find...

half-life - If 250mg of a radioactive element decays to 200mg in 48 hours, find ...

advanced functions HELP!!! - Radioactive decay is the process by which an ...

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

Chemistry - A certain radioactive element has a half life of 1 h. If you start ...

8th Grade Earth Science Help? - Which of the following terms refers to the time ...

Chemistry - As a sample of the radioactive isotope 131 I decays, its half-life a...