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Radioactive Decay
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Questions (597)
1. Which equation correctly shows beta decay?
(A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y (B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y (C)
5 answers
asked by
CJ
3,202 views
A crystal of zircon separated from an igneous rock, was analyzed, and found to contain 7930 atoms of 207Pb, and 12070 atoms of
2 answers
asked by
Tamara
593 views
a fragment of a bone is discovered to 20% of the usual C-14 concentration.estimate the age of the bone,given that half life time
4 answers
asked by
Anonymous
2,066 views
What daughter product is produced when thallium–206, an isotope of thallium, undergoes beta minus (β–) decay?
4 answers
asked by
Jamie
2,557 views
Skeletal remains had lost 84% of the C-14 they originally contained. Determine the approximate age of the bones. (Assume the
4 answers
asked by
Vanessa
4,955 views
Element X is a radioactive isotope such that every 86 years, its mass decreases by half. Given that the initial mass of a sample
5 answers
asked by
Josh
2,895 views
The half life of an element x is 5days. If we have 5g of x initially, what is the mass of x after
5 answers
asked by
Divine
1,900 views
A bone is found to have 45% of the original amount of carbon 14. If the half life of carbon is 5600 years, how old is the bone.
W
5 answers
asked by
Hannah
2,069 views
How does the nucleus change in beta-plus decay?
The mass number increases by one, and the atomic number remains the same. The
4 answers
asked by
:|
1,084 views
A rock contains 200. µmol 238U (t1/2 = 4.5 109 yr) and 116 µmol 206Pb. Assuming that all the 206Pb comes from decay of the
3 answers
asked by
Amber
1,459 views
Gallium65, a radioactive isotope of gallium, decays by first order-kinetics. The half-life of this isotope is 15.2 min. How long
4 answers
asked by
Val
4,013 views
Thallium -208 has a half-life of 3.053 min. How long will it take for 120g t decat ot 7.50g
4 answers
asked by
Anonymous
4,080 views
In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones
5 answers
asked by
jessica
7,933 views
A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per min.(cpm) compared to 40 cpm for new wood. If
4 answers
asked by
Connie
6,711 views
A sample of pure cobalt-60 has an activity of 8 µCi.
(t1/2 cobalt-60 = 5.26 a) (a) How many atoms of cobalt-60 are present in
4 answers
asked by
Trixie
820 views
nuclear equation for the decay of iridium−192 with β and γ emission
4 answers
asked by
Anonymous
701 views
In 6.20 h a 100 g sample of ag 112 decays to 25 grams. what is the half life of ag 112.
I think the answer is 3.10 but I'm not
5 answers
asked by
Jackie
4,550 views
The nuclide 96Nb decays by a first-order process with a rate constant of 2.96 × 10-2 h-1. How long will it take for 85% of the
4 answers
asked by
Jeremy
2,111 views
For the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern
5 answers
asked by
Derek
2,564 views
What order is the radioactive decay of carbon-14, an unstable isotope of carbon?
A. Third order B. Second order C. Zero order D.
4 answers
asked by
megan
1,580 views
The half-life of 156Hf is 0.025 s. How long will it take a 560 g sample to decay to one-fourth its original mass?
4 answers
asked by
julie
1,446 views
Fluorine-20 has a half-life of 11.0 s. If a sample initially contains 49.0 μg of this isotope, how much remains after 66.0 s ?
4 answers
asked by
susan
2,268 views
A radiation lab orders 64uCi of P-32. After 42 days the activity of the sample is 8.0uCi. What is the life of P-32?
Thanks
4 answers
asked by
Emily
2,021 views
If 100.0 g of carbon-14 decays until only 25.0 g of carbon is left after 11,460 y, what is the half-life of carbon-14?
4 answers
asked by
Jacob
3,569 views
measurements of carbon 14 taken from linen wrappings of the book of isaiah from the dead sea scrolls indicate that the scrolls
4 answers
asked by
L.Bianchessi
3,074 views
1) A radioactive substance decays exponentially. A scientist begins with 150 milligrams of a radioactive substance. After 26
4 answers
asked by
Hai
2,866 views
A fragment of bone is discovered to contain 20% of the usual carbon-14 concentration. Estimate the age of the bone to the
4 answers
asked by
Kristin
1,398 views
How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?
4 answers
asked by
jordan
1,225 views
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the
4 answers
asked by
ronnieday
2,534 views
How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay? The half-life for the radioactive decay of C-14 is
4 answers
asked by
Anonymous
3,673 views
A certain radioactive nucleus emits a gamma ray with an energy of 0.186 MeV.
Calculate the mass lost by the nucleus during the
4 answers
asked by
Ellen
1,720 views
how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?
4 answers
asked by
Kim
1,542 views
Strontium-90 decays through the emission of beta particles. It has a half-life of 29 years. How long does it take for 80% of a
4 answers
asked by
Urgent Help
1,353 views
Uranium-238 has half life of 4.51 * 10^9 years
Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of 8.0 *
4 answers
asked by
Harry
1,056 views
The cloth shroud from around a mummy is found to have a carbon-14 activity of 8.1 disintegrations per minute per gram of carbon
4 answers
asked by
Anonymous
2,684 views
A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function
m(t) =
4 answers
asked by
Melany
1,377 views
The rate of decay in the mass, M, of a radioactive substance is given by the differential equation dM dt equals negative 1 times
4 answers
asked by
Anonymous
4,276 views
Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of 239Np to decay to 0.100% of its original
4 answers
asked by
Anonymous
1,858 views
Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of Radium-223 to
4 answers
asked by
Michelle
2,686 views
The iodine-131 nuclide has a half-life of 8 days. If you originally have 625-g sample, how many grams will you have after 2
3 answers
asked by
Please help
983 views
The cesium-131 nuclide has a half life of 30 years. After 90 years, about 6g remain. What is the original mass of the cesium-131
3 answers
asked by
Please help
2,088 views
An atomic nucleus at rest decays radioactively into an alpha particle and a nucleus smaller than the original. What will be the
3 answers
asked by
Victoria
2,189 views
The age of wine can be determined by measuring the trace amount of radioactive tritium, 3H, present in a sample. Tritium is
3 answers
asked by
Anonymous
2,761 views
Nuclear reactions can be written out in equation form, with information about the nuclei that undergo the change and those that
4 answers
asked by
Fork
676 views
Having studied the data for patterns and trends, you should now be able to draw some conclusions about knowing the half-life of
4 answers
asked by
Word
1,617 views
Carbon-14 has a half-life of 5730 y. How much of a 144 g sample of a carbon-14 will remain after 1.719 (times) 10 4y?
3 answers
asked by
David
815 views
Chromium-48 has a short half-life of 21.6 h. How long will it take 360.00 g of chromium-48 to decay to 11.25g.
Please help me
3 answers
asked by
Cindy
1,215 views
how many half lives will it take for 50 g of 99Tc to decay to 6.25 g?
5 answers
asked by
Anonymous
1,989 views
A 1.00-g sample of carbon from a modern
source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source
7 answers
asked by
Eddy
1,458 views
Write the symbols and a balanced nuclear equation for the following:
a. Polonium -210 decays to give lead -206 b. Bismuth -211
3 answers
asked by
Anonymous
2,016 views
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