Posted by **Colby** on Tuesday, August 27, 2013 at 9:41pm.

Radioactive 24Na with a half-life of 14.8 hours is injected into an animal in a tracer experiment. How many hours will it take for the radioactivity to fall to 12.5% of its original intensity?

I am confused on what number to start with

## Answer this Question

## Related Questions

- Math. Have answer, please show work - In a tracer method the potassium isotope ...
- math - The radioactive isotope sodium-24 is used as a tracer to measure the rate...
- math - An unknown radioactive element decays into non-radioactive substances. In...
- CALCULUS PLEASE HELP - suppose m(0) milligrams of a drug are put in the blood of...
- Advanced Math Help! - suppose m(0) milligrams of a drug are put in the blood of ...
- CALCULUS PLEASE HELP!! - suppose m(0) milligrams of a drug are put in the blood ...
- Calculus-Modeling Equations - An unknown radioactive element decays into non-...
- Math - Find the half-life (in hours) of a radioactive substance that is reduced ...
- Calculas - suppose m(0) milligrams of a drug are put in the blood of an ...
- physics - The half-life of a certain radioactive isotope is 32 hours.What ...