Question

Carbon-14 has a half-life of 5,730 years. A fossil is found that has 28% of the carbon-14 found in a living sample. How old is the fossil? (Round your answer to the nearest year.)

Answer #1

carbon-14 has half-life 5730 years

let after t years the fossil has 28% carbon-14

let the carbon-14 decay function is
where P_{o} is the initial amount , k is the decay
constant & t is in years

thus

=>

=>

thus after 10523 years the fossil would have 28% carbon-14

If the half life of Carbon 14 is about 5,730 years, then a
fossil that has 1/4 the normal proportion of Carbon 14 to Carbon 12
should be how old?
20,900
2,800
17,200
1,400
11,400

A fossil was analyzed and determined to have a carbon-14 level
that is 20 % that of living organisms. The half-life of C-14 is
5730 years. How old is the fossil?

The half-life of carbon-14 is 5,730 years. An artifact produces
13.3 disintegrations of 14C per minute per gram of carbon in the
sample. Estimate the age of this sample assuming that its original
radioactivity was 15.3 disintegrations per minute per gram of
carbon.

3p An artifact has C-14 ( half life of carbon - 14 is
5,700 years) content that is 50% of that found in living organisms.
what is the approximate age of object?
a 11,000 years
b 17,000 years
c 23, 000 years
d 5,700 years

Part A)
The radioactive element carbon-14 has a half-life of 5750
years. A scientist determined that the bones from a mastodon had
lost 76.176.1% of their carbon-14. How old were the bones at the
time they were discovered?
Part B)
The radioactive element carbon-14 has a half-life of 5750
years. A scientist determined that the bones from a mastodon had
lost 63.763.7% of their carbon-14. How old were the bones at the
time they were discovered?

The radioactive element carbon-14 has a half-life of 5750
years. A scientist determined that the bones from a mastodon had
lost
64.5% of their carbon-14. How old were the bones at the time
they were discovered?

The following isotope has a half-life of 5,730 years. If we have
8.7×10-4 μμg of sample, how many years will pass until only 29% of
the original sample remains. The decay follows first-order
kinetics.

Carbon 14 (146C, mass of 14.003242u, half-life of 5730 years)
can be used to date things that were once living. When a particular
tree fell, a chunk of that tree would have had an activity of 15
decays/minute. Now, that chunk of the tree has a total of 1x10-12 g
of carbon 14 in it. How long ago did the tree fall? [3436.6
yrs]

The half-life of 14C is 5,730 years. If a sample contained 100
percent 14C and 0 percent 14N at a point in time 17,190 years ago,
then what percentage of 14C would it contain today

44g of petrified wood was found in a petrified forest. A sample
showed a carbon-14 activity of 100 decays/minutes. How long has the
tree been dead (in years)? (The half-life of carbon-14 is 5730
years and freshly cut wood has a carbon-14 activity of 14.96
decays/min per gram.)

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