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Radioactive Decay
Page 7
Questions (597)
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 anonymously
118 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is
3 answers
asked by
screaming pumpkin
17 views
Video #3, Question #2
The number in the box is and this is a form of decay.
3 answers
asked anonymously
116 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 anonymously
36 views
1) Nobelium has a half-life of 1 hour. If you start with 1 kg, how much will you have by this time tomorrow?
2) You have 90 g of
4 answers
asked by
kayla
460 views
1) Nobelium has a half-life of 1 hour. If you start with 1 kg, how much will you have by this time tomorrow?
2) You have 90 g of
1 answer
asked by
kayla
432 views
225/88ra>4/2he+221/__rn
The missing box would be the number and this is a form of decay.
3 answers
asked anonymously
76 views
The graph shows the radioactive decay of a bone that is found to contain 1/8 of the carbon-14 found in living animals today.
Appr
3 answers
asked anonymously
142 views
How many half-lives does it take a radioactive substance to decay until only one-eighth of the original substance remains?
a
3 answers
asked anonymously
104 views
1. The half-life for the (first-order) radioactive decay of 14C is 5730 yr (it emits a β ray with an
energy of 0.16 MeV). An
3 answers
asked by
Anne
636 views
Hi! I'm having lots of trouble figuring these two out.....if you could help that would be great- thanks!!
1. The half-life for
1 answer
asked by
Anne
481 views
Use the equation to answer the question.
238 92U→234 90N+42He Which type of radioactive decay does the equation model? (1
3 answers
asked by
Blue Berry
86 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is
3 answers
asked anonymously
68 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 anonymously
55 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 anonymously
44 views
225/88 RA---- 4/2He+221/ blank Rn The missing box would be the number and this is a form of decay.
3 answers
asked anonymously
36 views
There are 3.29g of Iodine 126 remaining in a smaple originally containing 26.3 g of iodine 126 the half life of iodine 126 is 13
2 answers
asked by
sam
916 views
What conclusion can be inferred from a 3.0 picogram sample of curium– 245 with a half-life of 8500 years?
The age of the
1 answer
asked anonymously
55 views
the isotope caesium -137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for the
1 answer
asked by
Pedro
676 views
What elements results if one of the neutrons is in a nitrogen neucleus is converted by radioactive decay into a proton?
The
1 answer
asked by
Jarrad Schomaker
704 views
In which type of radioactive decay does the nucleus become more stable without changing its identity?
• beta-plus decay •
1 answer
asked anonymously
53 views
What is the quantity of element X left after 10 days when starting with a 100-gram sample of element X with a 5-day half-life?(1
1 answer
asked anonymously
30 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of woud has 20 grams of carbon-14 when it is
1 answer
asked anonymously
33 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
1 answer
asked anonymously
30 views
The table below shows the half-life of an element:
Half-Life Data Element Half-Life Uranium-235 700 million years Scientists have
1 answer
asked by
Tom Kaulitz
52 views
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain 7,500 years?
a 50% b 1.5625% c
1 answer
asked anonymously
32 views
9. If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the
35 answers
asked by
Taryn S.
7,644 views
If the half-life of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain
A.6
13 answers
asked by
amor
4,290 views
What can scientists learn from the rate at which radioactive elements decay?
A. a rock's absolute age* B. the relative age of
9 answers
asked by
Brittany P.
3,758 views
An element has a half-life of 30 years. If 1.0 mg of this element decays over a period of 90 years, how many mg of this element
3 answers
asked by
Lynette
3,588 views
What is the half life of Carbon 14 according to the graph below?
* 1 point 5730 years 11460 years 17190 years 22920 years
1 answer
asked anonymously
97 views
assume the substance has a half-life of 11 years and the initial amount is 126 grams.How long will it be until only 15 %
3 answers
asked by
Jackie
2,031 views
what is the Half-life of strontium 90. Explain your work.
Okay well I already know the answer is 28yrs but I just don't know how
6 answers
asked by
Channy-Boo
1,853 views
A nucleus, initially at rest, decays radioactivly, leaving a residual nucleus. In the process, it emits two paricles
3 answers
asked by
Jordge
1,587 views
Iodine-131 has a half-life of 8 days. How many days would it take for a sample of Iodine -131 to go from 50 grams to 3.125
3 answers
asked by
Anonymous
1,552 views
The function A=A0e^-0.01386x models the amount in pounds of a particular radioactive material stored in a concrete vault, where
4 answers
asked by
Edith
1,525 views
The half – life for the disintegration of radium is 1590 years. Calculate the rate constant
in seconds and also how many years
4 answers
asked by
Thomas Tai Kants
1,500 views
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
1 answer
asked by
kary
51 views
Which statement best describes the effect of radioactive decay on a nucleus?
Responses The resulting nucleus is less stable than
1 answer
asked by
MOM
39 views
Which statement correctly classifies gamma emission?(1 point)
Responses Gamma emission is a type of radioactive decay, but it is
1 answer
asked anonymously
31 views
An unstable nucleus undergoes gamma decay. How does the nucleus change?(1 point)
Responses It becomes less stable by
1 answer
asked anonymously
40 views
fluorine-18 half life of 110 min if 100mg was shipped at 8:00 am how many mg are still active at 1;30 pm same day
2 answers
asked by
Anonymous
1,308 views
1)7Be decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface.
3 answers
asked by
Sandhya
1,318 views
Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg
4 answers
asked by
Steven
1,308 views
The half-life of Carbon-14 is 5730 years. What is the age of a fossil containing 1/16 the amount of Carbon-14 of living
2 answers
asked by
Melissa
1,300 views
Which type of radiation ; alpha, beta, and gamma produces the least change in mass number? In atomic number?
2 answers
asked by
Shelly
1,256 views
radioactive Carbon 14 in a dead organism decays according to the equation A=A e^.000124t where t is in years and A0 is the
2 answers
asked by
veronica
1,193 views
If U-238 splits into two even pieces, and each piece emits an alpha particle, what elements are produced?
2 answers
asked by
Lee
1,139 views
The isotope carbon-14, 146C, is radioactive and has a half-life of 5730 years. If you start with a sample of 1000 carbon-14
2 answers
asked by
Sidiqi
1,148 views
a sample of sodium-24 with an activity of 12 mCi is used to study the rate of blood flow in the circulatory system. If sodium-24
2 answers
asked by
rachel
1,151 views
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