Tuesday

November 25, 2014

November 25, 2014

Posted by **brittany** on Thursday, May 12, 2011 at 5:23pm.

- chemistry -
**DrBob222**, Thursday, May 12, 2011 at 5:33pmIs that 99.9% or some other value? You have no units.

k = 0.693/t_{1/2}

Substitute and solve for k, then substitute k into the equation below.

ln(No/N) = kt

No = some convenient number like 100.

N will be 0.1 if 99.9% of the atoms have decayed.

k from above.

Solve for t (in the same units as the half life is given).

**Answer this Question**

**Related Questions**

Chemistry - The half-life of phosphorus-32 is 14.26 days. The decay constant is ...

Business Mgmt. - I need to write a paragraph on Identifying the demographics and...

chemistry - if you start with 100mg of radioactive material that has a half life...

Math - There are four brown shoes and 10 black shoes on the floor. your puppy ...

chemistry - A particular radioactive substance has a half-life of 4 minutes. How...

Science - A material has 32 atoms in all; 24 decayed and the rest undecayed. If ...

Math - How do I solve this if there is no equation to this 1. The population of ...

Physics - You are sitting in your car at a traffic light at the foot of a 200 ft...

math - A men's shoe store uses a markup rate of 115% on its most popular brands ...

physics - You see a pair of shoes tied together by the laces and hanging over a ...