Question

Carbon-14 has a half-life of approximately 5,730 years. How many half-lives have occurred in a sample that contains 25 percent of the original amount of the parent isotope?

1

2

3

4

Answer 1

@bobbylynn u know the answer?

Answer 2

?

Answer 3

ask someone :)

Answer 4

ok i did

Answer 5

hmu when you got the answer

Answer 6

The half life of carbon 14 is 5700 years. So If a fossil is 5700 years old then half of the carbon-14 is left. I think this may be it! I tried!

Answer 7

so the answer is 2?

Answer 8

do you have answer choices?

Answer 9

Oh yeah!

Answer 10

I think so! Thats my guess!

Answer 11

OK, Jorge, this is very similar to the math question I asked you to post in mathematics a few moments ago...

Answer 12

But that is pretty much a biology question. well more like Chemistry

Answer 13

It's more of a chemistry question than math or biology.
1 half life: 100% ---> 50%
2nd half life: 50% ---> 25%

2 half lives.