Posted by Eddy on Monday, April 25, 2011 at 2:33pm.
A 1.00g sample of carbon from a modern
source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? The halflife of carbon14 is 5.73×103 year.
a. about 34,400 years
b. about 345,000 years
c. about 20 million years
d. less than a few years

chemistry  Eddy, Monday, April 25, 2011 at 2:34pm
Typo: The halflife is 5.7x10^3

chemistry  drake, Monday, April 25, 2011 at 5:11pm
Without even doing the math it the change in disintegrations is merely .03333, the sample must have decayed for
d. less than a few years

chemistry  drake, Monday, April 25, 2011 at 5:16pm
whoops, i did the math and it came out to about 34,400 years. Sorry for my earlier answer

chemistrycan't get 34,000 yrs  DrBob222, Monday, April 25, 2011 at 6:28pm
k = 0.693/t_{1/2}
k = 0.693/5.7E3 = 1.22E4
ln(15.3333/15.3) = 1.22E4(t)
t = about 18 year.

chemistry  Anonymous, Monday, April 25, 2011 at 11:39pm
vanden bout

chemistry  mayra, Tuesday, October 15, 2013 at 3:07pm
actually drake was right on his first answer i had this question on my homework and it is d. less than a few years :)
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