Question

PLEASE HELP!!! The half life of carbon-11 is 20 minutes. A sample of carbon-11 has

25mCi. How much is left after 1 hour?*
A)12.5mci
B)10.2mCi
C)2.25mci
D)3.125mci

Answer 1

3.125 (D)

Explanation:

1 is 1/2

25-1 4

20x3 = 60mins

3.125 would be took away results end with what you have took for this equation