Question

(A)This exercise uses the radioactive decay model.

The burial cloth of an Egyptian mummy is estimated to contain 58%
of the carbon-14 it contained originally. How long ago was the
mummy buried? (The half-life of carbon-14 is 5730 years. Round your
answer to the nearest ten years.)

yr

(b)This exercise uses the radioactive decay model.

A wooden artifact from an ancient tomb contains 60% of the
carbon-14 that is present in living trees. How long ago was the
artifact made? (The half-life of carbon-14 is 5730 years. Round
your decay rate, r, to 6 decimal places. Then round your answer to
the nearest whole number.)

yr

Answer #1

Carbon-14 is a radioactive isotope of carbon. It decays into
Nitrogen-14 through beta decay, with a
half-life of 5730 years. By comparing the amount of
radioactive Carbon-14 with the amount of stable
Carbon-12 (the most common isotope of carbon), we can
determine the age of an object.
a) How many protons and neutrons are in Carbon-14?
Carbon-12?
b) How many years will it take for an object to lose 87.5% of
its Carbon-14?
c) If 10000 years have passed, what...

15.58 The half-life for the radioactive decay of C−14 is 5730
years. How long will it take for 25% of the C−14 atoms in a sample
of C−14 to decay? If a sample of C−14 initially contains 1.9 mmol
of C−14, how many millimoles will be left after 2250 years?

The half-life for the radioactive decay of C−14 is 5730
years.
Part A: How long will it take for 25% of the C−14 atoms in a
sample of C−14 to decay?
Part B: If a sample of C−14 initially contains 1.9 mmol of C−14,
how many millimoles will be left after 2255 years?

Carbon 14 is a radioactive isotope of carbon, the most common
isotope of carbon being carbon 12. Carbon 14 is created when cosmic
ray bombardment changes nitrogen 14 to carbon 14 in the upper
atmosphere. The resulting carbon 14 combines with atmospheric
oxygen to form radioactive carbon dioxide, which is incorporated
into plants by photosynthesis. Animals acquire carbon 14 by eating
plants. When an animal or plant dies, it ceases to take on carbon
14, and the amount of isotope...

Part A
You are using a Geiger counter to measure the activity of a
radioactive substance over the course of several minutes. If the
reading of 400. counts has diminished to 100. counts after 78.4
minutes , what is the half-life of this substance?
Express your answer with the appropriate units.
Part B
An unknown radioactive substance has a half-life of 3.20 hours .
If 26.8 g of the substance is currently present, what mass
A0 was present 8.00 hours...

You are using a Geiger counter to measure the activity of a
radioactive substance over the course of several minutes. If the
reading of 400. counts has diminished to 100. counts after 54.3
minutes , what is the half-life of this substance?
Express your answer with the appropriate units.
t1/2 =
27.2 min
Correct
Part B
An unknown radioactive substance has a half-life of 3.20 hours .
If 20.6 g of the substance is currently present, what mass
A0 was...

please do this step by step and in detail please!!!
extremely stuck on this problem and i just don't get it
help!
30. Radiocarbon Dating.
Carbon 14 is a radioactive isotope of carbon, the most common
isotope of carbon being carbon 12. Carbon 14 is created when cosmic
ray bombardment changes nitrogen 14 to carbon 14 in the upper
atmosphere. The resulting carbon 14 combines with atmospheric
oxygen to form radioactive carbon dioxide, which is incorporated
into plants by photosynthesis....

All living things are radioactive due to the presence of 14 6 C
which undergoes beta decay, emitting an electron. The half-life of
14 6 C is 5730 y. In live specimens, the level of 14 6 C present is
constant. After death, the decay of 14 6 C slowly reduces the
amount of 14 6 C present. Each gram of a live specimen emits 15.3
electrons per minute. An animal bone found at an archaeological
site emits 86 electrons...

The half-life of a radioactive isotope represents the average
time it would take half of a collection of this type of nucleus to
decay. For example, you start with a sample of 1000 Oxygen-15 (15O)
nuclei, which has a half-life of 122 seconds. After 122 seconds,
half of the 15O nuclei will have decayed into Nitrogen-15 (15N)
nuclei. After another 122s, half of the remaining Oxygen nuclei
will have also decayed, and so on. Suppose you start with 4.00×103
15O...

Cosmic ray bombardment of the atmosphere produces neutrons,
which in turn react with nitrogen to produce radioactive carbon-14.
Radioactive carbon-14 enters all living tissue through carbon
dioxide (via plants). As long as a plant or animal is alive,
carbon-14 is maintained in the organism at a constant level. Once
the organism dies, however, carbon-14 decays exponentially into
carbon-12. By comparing the amount of carbon-14 to the amount of
carbon-12, one can determine approximately how long ago the
organism died. (Willard...

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