Question

You have 72 grams of a radioactive kind of actinium. If its half-life is 6 hours, how much will

be left after 12 hours

Answer 1

There will be 18 grams left after 12 hours.

Explanation:

Half-life is the amount of time it take for a cell to turn from one condition to another.

To find the amount of grams for the first 6 hours.

72 ÷ 2= 36

Now, since 6 x 2 = 12, we need to divide 36 by 2 to find the next half-life.

36 ÷ 2 = 18

Therefore, there will be 18 grams left after 12 hours.

Hope this helps! :D