Question

A wooden artifact from a Chinese temple has a 14C activity of 44.5 counts per minute as compared with an activity of 58.2 counts per minute for a standard of zero age. From the half-life for 14C decay, 5715 yr, determine the age of the artifact.

From the half-life for 14C decay, 5715 yr, determine the age of the artifact.

Answer #1

**Answer –** Given, Nt = 44.5 cpm , Ni = 58.2 cmp
,

Half life t ½ = 5715 yr ,

So decay constant ,k = 0.693 / t ½

= 0.693 / 5715 yr

= 0.000121 yr^{-1}

We know formula for the first order

ln Nt / Ni = -k * t

ln 44.5 / 58.2 = - 0.000121 yr^{-1} * t

-0.2684 = -0.000121 yr^{-1} * t

So, t = -0.2684 / -0.000121 yr^{-1}

= 2213.4 yrs

So the age of the artifact is **2213.4 yrs**

A wooden artifact from a Chinese temple has a 14C
activity of 40.7 counts per minute as compared with an activity of
58.2 counts per minute for a standard of zero age.
From the half-life for 14C decay, 5715 yr, determine
the age of the artifact.

The cloth shroud from around a mummy is found to have a 14C
activity of 8.0 disintegrations per minute per gram of carbon as
compared with living organisms that undergo 16.3 disintegrations
per minute per gram of carbon. From the half-life for 14C decay,
5715 yr , calculate the age of the shroud. Express your answer
using two significant figures.

A wooden artifact is found in an ancient tomb. Its carbon-14
14
6
C
activity is measured to be 65.0% of that in a fresh sample of
wood from the same region. Assuming the same amount of
14C was initially present in the artifact as is now
contained in the fresh sample, determine the age of the
artifact.
yr

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.

The radioactive 14C in living organisms results in an activity
of 15.3 disintegrations per minute per gram (d/min·g) of carbon. If
a piece of leather uncovered by an archeologist is measured to have
9.0 d/min·g, what is the approximate age of the leather? The
half-life of 14C is 5730 years.

A nuclear reaction involves the first order decay from and has a
half-life of 5730 yr. Living organisms have a 14C decay rate of
0.85 disintegrations per minute per gram of carbon. What is the
value for the rate constant for this decay? If the initial
concentration of 14C in a sample were 8.82 x 10-3 M, how much would
remain after 936 years?

An ancient wooden club is found that contains 77 g of carbon and
has an activity of 7.0 decays per second.
Determine its age assuming that in living trees the ratio of
14C/12C atoms is about 1.3×10^-12

An ancient wooden club is found that contains 78 gg of carbon
and has an activity of 8.8 decays per second. Determine its age
assuming that in living trees the ratio of 14C/12C14C/12C atoms is
about 1.3×10−121.3×10−12.

Living matter has 1.3 x 10-10% of its carbon in the form of 14C
which has a half-life of 5730 yr. A mammoth bone has a 300 g sample
of carbon separated from it, and the sample is found to have an
activity of 20 decays per second. How old is the bone?
a) 6,400 yr
b) 7,600 yr
c) 10,900 yr
d) 11,500 yr

An ancient club is found that contains 100 g of pure carbon and
has an activity of 6 decays per second. Determine its age assuming
that in living trees the ratio of 14C/12C
atoms is about 1.10 × 10-12. Note that
the half life of carbon-14 is 5700 years and the Avogadro number is
6.02 × 1023.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 8 minutes ago

asked 19 minutes ago

asked 19 minutes ago

asked 39 minutes ago

asked 41 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago