Monday

September 22, 2014

September 22, 2014

Posted by **julie** on Thursday, January 13, 2011 at 10:52am.

now, how much did you have 55 minutes ago?

- half life -
**DrBob222**, Thursday, January 13, 2011 at 3:17pmk = 0.0.693/t

_{1/2}

k = 0.693/31 = 0.0224 min^-1

ln(No/N) = kt

No = unknown

N = 77

k = from above.

t = 55 min

- half life -
**h**, Friday, January 14, 2011 at 7:04pmlook at the intro to nuclear physics (2500U) tutorial notes (tut 6 i think)

**Answer this Question**

**Related Questions**

chemistry - If there are 80 milligrams of a radioactive element decays to 10 ...

half-life - 1. The half-life of a first-order reaction is 9.89 minutes. How many...

science - If the half-life of a 20.0g is known to be 24 minutes, how long will ...

Science - 43Lb has a half life of 42 minutes. If you start with 100 grams, how ...

chemistry - If something originally contained 32.0 g of Po-210, which has a half...

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

Half-Lifes - How much of a 6gram sample of silver-105m would remain after 4 ...

physics - If the physical half-life of sulfur-35 is 87.1 days, and the biologic...

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

chemistry - A given reaction has an activation energy of 24.52 kJ/mol. At 25C ...