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Radioactive Decay
Page 6
Questions (597)
the half-life of 234U, uranium-234, is 2.52 x 10^5yr. If 98.5% of thee uranium in the original sample is present, what length of
3 answers
asked by
ellen
374 views
a certain radioactive isotope has a half life of approx 1,300 years .
How many years to the nearest year would be required for a
1 answer
asked by
HM
421 views
a radio actice substance decays so that half of the substance decays every 2 minutes. if 100 g of the substance are present
3 answers
asked by
Angela
615 views
In a series of decays (hypothetical), the nuclide Ra-227 beomes Pb-203. How many alphas and how many betas are emitted in this
1 answer
asked by
Lauren
485 views
tritium has a half life of 24.3 years .a sample of 0.1 is produced . will tthe mass of tritium change after 24.3 years
1 answer
asked by
Anonymous
472 views
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has
3 answers
asked by
URMUM
40 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.163 × 1011 years longer. What is the
3 answers
asked by
Send help
162 views
1. Which phrase describes radioactive decay?
the spontaneous emission of radiation the joining of small nuclei into a larger
10 answers
asked by
i hope ur having a great day :)
339 views
How would I calculate the age of a rock only given the amount of each in grams and half-life?
40K decays to 40Ar. Half life of
2 answers
asked by
Lena
576 views
element x has a half life of 90 seconds. How much of a 100 gram sample of element x is left after half an hour
1 answer
asked by
frances
487 views
A meteorite has landed at UOIT! Chemical analysis shows that it contains 1
gram of potassium and 1E-5 grams of argon, assumed to
1 answer
asked by
amy
1,087 views
A researcher wishes to extract
140 La from 140 Ba. She obtains a 1000 MBq virgin Ba-140 sample and must wait until the maximum
2 answers
asked by
amy
564 views
If a polonium-210 (Po-210) atom has just decayed, how close can the ejected
alpha particle get to a neighboring Po-210 nucleus?
1 answer
asked by
Jake
496 views
If a polonium-210 (Po-210) atom has just decayed, how close can the ejected
alpha particle get to a neighboring Po-210 nucleus?
1 answer
asked by
Marty
466 views
Tossing candies (or whatever you used) was a great way to simulate half-life because it showed how almost half of the parent
3 answers
asked by
JACK HAMMMMMMER
98 views
Carbon-14 Dating.
Only 10% of the carbon-14 in a samll wooden bowl remains. How old is the bowl? Half life of carbon is 5700
3 answers
asked by
Vince
748 views
Only 27% 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
Laura Hieb
503 views
If 50% of a radioactive element remains after 4000 years, what is the half-life?
a. 1 half-life b. 2 half-lives c. 3 half-lives
3 answers
asked by
Jackie66
50 views
The rate of the following reaction:
Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is
2 answers
asked by
Confused
780 views
Which is the BEST definition of Half-Life? a The half-life of a substance or element is the amount of matter it takes for all of
3 answers
asked anonymously
49 views
a half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463x10^11 years longer. What is the half-life
5 answers
asked by
ollie
147 views
he graph shows the radioactive decay of a bone that is found to contain 1/8 of the carbon-14 found in living animals today.
Appro
3 answers
asked anonymously
49 views
Which is the BEST definition of Half-Life?
a The half-life of a substance or element is the amount of energy it takes for all of
3 answers
asked anonymously
44 views
TOOLS The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463 * 10 ^ 11 years longer. What is
3 answers
asked anonymously
64 views
TOOLS The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463 * 10 ^ 11 years longer. What is
3 answers
asked anonymously
64 views
Technetium-99m is a radioactive isotope commonly used in medicine as a radioactive tracer. A radioactive tracer is an isotope
3 answers
asked by
Snaggy
71 views
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has
3 answers
asked by
Snaggy
28 views
225/88 RA → 4/2 He+ 221/ blank Rn
The missing box would be the number ____ ? And this is a form of ____ decay?
3 answers
asked by
Lila
87 views
225/88 RA → 0/-1 e + blank/89 Ac
The missing box would be the number ____ ? And this is a form of ____ decay?
3 answers
asked by
Lila
57 views
225/88 Ra → 0/0Y + blank/88 Ra
The number in the box is the ____ and this form of ____ decay.
3 answers
asked by
Hhh
47 views
225/88 Ra → 0/0Y + blank/88 Ra
The number in the box is the ____ and this form of ____ decay.
3 answers
asked by
kkknnn
63 views
225/88 Ra → 0/0Y + blank/88 Ra
Fill in the blanks The number in the box is the ____ and this form of ____ decay.
3 answers
asked by
kkknnnjj
83 views
225/88 RA → 0/-1 e + blank/89 Ac
The missing box would be the number ____ ? And this is a form of ____ decay?
3 answers
asked by
Sheuueuwjwjwjwjwjjej
54 views
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has
3 answers
asked by
Uuu
41 views
S-35 (t1/2 = 87.4 d) is used in cancer research. The biological half-life in the human body is 90 days. What is the effective
1 answer
asked by
Anonymous
393 views
if a sample of the radioactive nuclide 139cs has an activity of 0.0730 ci, what is the instantaneous rate of decomposition of
1 answer
asked by
Anonymous
377 views
The half-life of 13252Te is 3.26 days. This isotope decays by beta emission to a highly unstable intermediate that decays
1 answer
asked by
brody
469 views
A researcher needs 5.00 mg of 128Ba for an experiment. If the half-life of 128Ba is 2.43 days, how many milligrams of 128BaCl2
5 answers
asked by
me
979 views
If a rock contains an isotope with a half live of 600 million years, and 0.5 half lives have elapsed since the rock formed, how
2 answers
asked by
Dana
530 views
31. Radioactive decay of material is determined using the formula N = Noe^-kt. Find the constant k for Plutonium-239 given that
1 answer
asked by
Emily
838 views
Which statement below correctly explains what is happening to the number of parent and daughter atoms with each half-life?
a For
3 answers
asked anonymously
39 views
the half-life of carbon-11 is 20 minutes. How long will it btake for 600g of carbon-11 to decay to 30g?
3 answers
asked by
Mark
581 views
An Initial amount of 100 grams of Thorium-234 decays according to the model: dP/dt=-0.02828P (where t is measured in years).
a)
1 answer
asked by
RC
680 views
Answer:
The answer is: The mass number remains the same, and the atomic number decreases by one. The rest of the assignment:
3 answers
asked by
your mother
67 views
Radium-221 has a half-life of 30 s. How long will it take for 95% of a sample to decay
4 answers
asked by
Shellie
2,747 views
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×109 years. The half-life of
3 answers
asked by
sleepy
122 views
Why does the emission of an alpha particle always result in transmutation?
Energy is released from the nucleus of the atom.
11 answers
asked anonymously
47 views
Use the equation to answer the question.
146C→147N+0−1e Which type of radioactive decay does the equation model? (1 point)
3 answers
asked by
Blue Berry
162 views
An unstable nucleus undergoes gamma decay. How does the nucleus change?(1 point)
Responses It becomes less stable by emitting
3 answers
asked by
Blue Berry
173 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×1011 years longer. What is the
7 answers
asked by
XavionFrost77
34 views
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