Posted by Angie on Saturday, April 4, 2009 at 10:10pm.
how old is a mammoth's tusk if there is only 25 percent C14 remaining in the sample?
a.5700 years
b.11400 years
c.17100 years
d.22800 years

science  bobpursley, Saturday, April 4, 2009 at 10:26pm
Half disappeared in one halflife.
Half that remaining disappeared in the next halflife.

science  Angie, Saturday, April 4, 2009 at 10:44pm
..what does that mean?

science  PsyDAG, Sunday, April 5, 2009 at 12:40pm
Knowing the halflife of C14 would allow you to take twice the halflife.
From searching the Internet under "C14 half life", I found that the halflife of Carbon 14 is 5730 years.
This should help a little more. Thanks for asking.

science  steve vincent, Monday, February 6, 2012 at 5:09pm
b.11400 years

Chemistry  Oscar, Monday, February 4, 2013 at 8:34pm
B. 11400 years

science  Sally, Tuesday, January 14, 2014 at 10:26pm
5700
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