Question

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

Answer #1

**Last option** is the right answer. The half life
of C14 is given to be 5730 years, so half the amount of C14 would
be left after 5730 years and after another half life of 5730 years
(11460 years in total) the amount of C14 left in the fossil would
be one-fourth (1/4) the original amount. One fourth amount of the
C14 would be left in the fossil after 2 half lives (of 5730
years) which is equivalent to 11460 years or approximately
**11400** **years**.

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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.)

The isotope 146C has a half-life of 5,730
years. If a fossil is found to contain 1/64th the amount
of carbon-14 as is typically found in a living plant or animal, 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.

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?

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?

Q1. Carbon-14 – or 14C – is a radioactive isotope of carbon with
a half-life of 5,730 years. It decays into nitrogen-14 – or 14N – ,
which is a stable isotope of nitrogen.
(a) Which of the three nuclear decay processes describes the decay?
Explain. (Hint: You can get the atomic number of carbon and
nitrogen from a periodic table.)
(b) Write down the equation for the decay.
(c) What is the decay constant for 14C?
All isotopes of...

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.

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

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]

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