Monday

December 22, 2014

December 22, 2014

Posted by **Melanie** on Saturday, July 30, 2011 at 7:38pm.

Find the half-life of Cesium-137 (Round to the nearest year)

How much Cesium-137 is left in the sample after 60 years? Round to the nearest tenth of a gram.

- algebra -
**drwls**, Sunday, July 31, 2011 at 10:32amIf T is the half life,

(1/2)^(t/T) = 0.16/0.20 = 0.80

where t = 10 yr

(t/T) = 0.3219

T = 31 yr

After 60 yr, the fraction left is

(0.5)^(60/31) = 0.261

Amount left = 200*0.261 = 52.3 g

**Answer this Question**

**Related Questions**

word problem - The half life of cesium-137 is 30 years. Suppose we have a 10-g ...

chem - Cesium-137 has a half life of 30.0 years. If initially there are 8.0 kg ...

Chemistry please help! - A Cesium 137 sample has a measured radioactivity of 50 ...

Chemistry/math - Cesium-137 has a half-life of 30 years. Suppose a lab stored a ...

Calculuc - How do you set up this problem? The decay constant for the ...

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

Chemistry - Which radioactive sample would contain the greatest remaining mass ...

Nuclear Physics - An investigator receives Co-60 (5.27 year half life) for use ...

AP Calculus - An Initial amount of 100 grams of Thorium-234 decays according to ...

Chemistry - A sample of cesium metal reacted completely with water, evolving 48....