# Curium-243 has a half-life of 285 days. In a sample of 5.6 grams of curium-243. how many grams will remain after 12 days?

##### 1 Answer

May 30, 2017

#### Answer:

approximately 5.4g

#### Explanation:

You can use the formula:

Where N is the amount of radioactive isotopes left to the time "t" (in this case t is measured in days). In this case measured in grams.

Insert the numbers to get:

As a side note, I'm pretty sure Cm-243 has a lot longer half-life than that :P