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Radioactive Decay
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Questions (597)
The complete decay of Americium-241 involves successively with a (alpha), a, B(beta), a, a, B, a, a, a, B, a production.
4 answers
asked by
Anonymous
1,463 views
Could someone help explain this problem to me . . .
Carbon 14 has a half-life of 5700 year, scientist use this fact to determine
4 answers
asked by
Andy
2,899 views
Gold (Au) has a synthetic isotope that is relatively unstable. After 25.5 minutes, a 128-gram sample has decayed to 2 g.
What is
4 answers
asked by
Nyib
1,422 views
Calcium-45 has a half-life of 162.7 days. four half-lives have elapsed, how much time has passed? 1.783 years 40.68 days 650.8
3 answers
asked anonymously
43 views
A vial contains radioactive iodine-131 with an activity of 2.0 mCi/mL. If a thyroid test requires 2.6 m Ci in an "atomic
3 answers
asked anonymously
54 views
A 238U nucleus is moving in the x-direction at 4.8×105m/s when it decays into an alpha particle (4He) and a 234Th nucleus. The
5 answers
asked by
Peter
2,298 views
What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!
4 answers
asked by
Matthew
2,908 views
Suppose that drilling into what was once a lake bottom produces a piece of
wood which, according to its mass, would have
2 answers
asked by
Anonymous
701 views
In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones
3 answers
asked by
Cratch
2,395 views
Carbon-14 has a half-life of 5700 years. The charcoal from a tree killed in the volcanic eruption that formed Crater Lake in
3 answers
asked by
Sarah
1,403 views
A radioactive isotope sits unused in the lab for 10 years at which it decays to 80% of original amount. Find the half life and
3 answers
asked by
Daisy
346 views
Carbon-14 decay (radiocarbon dating) is used in archaeology to measure
the age of ancient pottery. Carbon-14 has a half-life of
3 answers
asked by
john
427 views
Two radioactive sources X and Y have half-lives of 3.0 hours and 2.0 hours, respectively. The product of the decay is a stable
3 answers
asked by
Valeriya
747 views
Examine the following equations.
A. 23490Th→23491Pa+0−1e+γ B. 60∗27Co→6027Co+γ C. 23490Th→23088Ra+42He D.
4 answers
asked by
Dianni
3,754 views
if a 84g sample of thorium decays with a 10 minute half life, how much would the sample weight in a half hour?
3 answers
asked by
nancy
1,415 views
Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react with nitrogen to produce radioactive carbon-14.
3 answers
asked by
Shelia
918 views
The half-life of krypton-91 (91Kr) is 10 s. At time
t = 0 a heavy canister contains 5 g of this radioactive gas. (a) Find a
3 answers
asked by
Kristen
1,063 views
_The_Natural_Base_e_
An accident in 1986 at the Chernobyl nuculear plant in the Ukraine released a large amount of plutonium
3 answers
asked by
Student09
1,159 views
Radioactive radium () has a half-life of 1599 years. What percent of a given amount will remain after years?
4 answers
asked by
Pamela
1,221 views
The half-life of carbon 14, which is commonly used to date organic materials, is 5700 years. What is the minimum age of sample
4 answers
asked by
M.T.
597 views
The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. How many
6 answers
asked by
Mindy
3,120 views
Only 34% of the carbon-14 in a wooden bowl remains. How old is the bowl? (Carbon-14 has a half-life of 5,700 years.)
4 answers
asked by
Lexi
580 views
please help me with this chemistry problem.
Half-Life A radium-226 sample initially contains 0.112 mol. How much radium-226 is
4 answers
asked by
shylo
664 views
If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in
3 answers
asked by
jojo
3,349 views
A wooden artifact contains 70% Carbon-14. To the nearest year, how many years old is the artifact? The half life of Carbon-14 is
3 answers
asked by
Michael
110 views
An element has a half-life of 29 hours. If 100 mg of the element decays over a period of 58 hours, how many mg of the element
4 answers
asked by
Anonymous
1,366 views
Help?
Having studied the data for patterns and trends, you should now be able to draw some conclusions about how knowing the
3 answers
asked by
Kay
826 views
Iodine-131 has a half life of 2.2 × 10-2 year. How long will it take to reduce a 130 g sample of 131I to 74 g 131I?
3 answers
asked by
Kymora
1,590 views
The radioactive decay of carbon-14 is first-order and the half-life is 5800 years. While a plant
or animal is living, it has a
3 answers
asked by
anonymus
1,480 views
The half life of radium is 1590 yrs. how long will it take to 1 gm of element to loose 0.1gm
4 answers
asked by
Mehnaaz
1,112 views
After 10 years, a 100 mg sample of argon-42 has decayed to 81 mg. estimate the half life of argon-42.
I'm on the last part
2 answers
asked by
Lomonoyan
818 views
If 9.00 g of _27^60 Co (half-life = 5.30 y) are allowed to decay, how many grams would be left after 1.00 y and after 10.0 y?
g
1 answer
asked by
tarsa
345 views
How old is a sample that contains 125 atoms of U-235 and 375 atoms of Pb-207?
...Given that the half life values on my handout
3 answers
asked by
J
1,262 views
Assuming an element's half-life is 3.6 years. How much of 2 grams of the element would remain after 10.8 years?
4 answers
asked by
Chandler
1,493 views
The half life of Am-241 is 432 y. If 2.00 g of Am-241 is present in a sample, what mass of Am-241 is present after 1000.0 y?
2 answers
asked by
bekah
538 views
The half-life of uranium-235 is 713 million years. Suppose a fossil originally had 26 grams of uranium-235. A geologist had the
3 answers
asked by
jim
789 views
3. Radioactive decay of nuclei often involves several decays before a stable nucleus is formed. This is called a decay chain.
3 answers
asked by
Adam
1,012 views
17. Why can't carbon-14 be used to determine the age of fossils that are several hundred thousand years old?
Please and thank
3 answers
asked by
CJ
1,065 views
Andrew measures they amount of a very unstable substance to be 100 moles. the half life of this substance is 3 days(after 3
3 answers
asked by
Anonymous
947 views
the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years
3 answers
asked by
joe
2,744 views
Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of
5 answers
asked by
Potassium-40 has a half-life of approximately 1.25
1,560 views
the half-life of a radium is 1690 years is 90 grams is present now, how much will be present in 70 years
3 answers
asked by
Anonymous
1,417 views
How many grams of a 250- g sample of thorium - 234 would remain after 40 days had passed?
4 answers
asked by
Divine
1,677 views
The half life of carbon-14 is 5700 years. A certain sample of wood has 20 grams of carbon -14 when it is alive. How many grams
3 answers
asked by
Jozikee
50 views
The half-life of uranium-235 is 700000000years The half-life of uranium-238 is 4.463 * 10 ^ 11 years longer. What is the
5 answers
asked anonymously
156 views
22Na has a half-life of 951 days. How many grams of a 1.00 kg sample would be
left after 4 years?
3 answers
asked by
Samantha
314 views
Palladium-107 undergoes â decay (t1/2 = 6.5 x 105 yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to
4 answers
asked by
Queen
1,895 views
the concentration of tritium in the wine is 0.34 times that found in the freshly bottled wines. if the half life of the tritium
4 answers
asked by
Queen
656 views
You want to heat a satellite by radioactive decay of 238 plutonium. Assume you need heating of 200 Watts (J/s), how many
3 answers
asked by
Anonymous
536 views
Assume a substance has a half-life of 11 years and the initial
amount is 144 grams. How much remains at the end of 5 years? How
4 answers
asked by
nick
1,756 views
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