Question

The half-life of a specific element was calculated to be 5,200 years. What percentage of a sample of the pure element will remain after two half-lives?



5%


10%


25%


75%

Answer 1

After every half-life, decreases the amount by 50%. If you start with 100%, how much is gone after 1 half life?

Answer 2

50

Answer 3

and then half that to get the percentage after the 2nd half life

Answer 4

0

Answer 5

No 25

Answer 6

half of 50%

Answer 7

right 25%

Answer 8

Would that be my answer?

Answer 9

yes