Wednesday

August 20, 2014

August 20, 2014

Posted by **TITA** on Monday, November 23, 2009 at 7:19pm.

How much will be left at the end of the third year of thr original sample?

How much will be left at the end of the fourth year of the original sample?

- Physics -
**drwls**, Monday, November 23, 2009 at 7:45pmFraction left at t = (1/2)^(t/T)

where T is the half life, which is 5 years in this case.

For the first question, solve

(1/2)^(2/5) = 75.8%

Repeat using the same formula for the other times t.

**Related Questions**

Science - if a radioactive isotope has a half-life of one year, how much of the ...

Science - if a radioactive isotope has a half-life of one year, how much of the ...

physics - If a radioactive isotope has a half-life of 1 year, how much of the ...

Physics - Consider a radioactive sample with a half-life of one week. How much ...

Physics - A certian radioactive isotope has a half-life of 1 hour. If you start ...

Chemistry *URGENT* - URGENT help! 3. A rock sample was dated using potassium-40...

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

calculus - A sample of a radioactive substance decayed to 94.5% of its original ...

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

Physcis 30 - Q1) If there are 100 radioactive atoms with a half-life of 30 ...