Posted by brittany on Thursday, May 12, 2011 at 5:23pm.
If you accidentally spill phosphorus32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?

chemistry  DrBob222, Thursday, May 12, 2011 at 5:33pm
Is 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 halflife of phosphorus32 is 14.26 days. The decay constant is ...
 Physics  Emma is working in a shoe test lab measuring the coefficient of ...
 Physics  Emma is working in a shoe test lab measuring the coefficient of ...
 Business Mgmt.  I need to write a paragraph on Identifying the demographics and...
 Liberal Arts  A girl has 7 skirts, 5 blouses, and 6 pairs of shoes. How many ...
 pre calc  You have a sample of a certain radioactive substance. After two days...
 pre calc  You have a sample of a certain radioactive substance. After two days...
 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 halflife of 4 minutes. How...
More Related Questions