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Radioactive Decay
Page 10
Questions (597)
A sample of charcoal is found to have only 1/8th of Carbon-14. Half-life of Carbon-14 is 5730yrs, what is the age of the
3 answers
asked by
Anonymous
571 views
How many years will it take for 88g tritium to decay to an 11g sample?
3 answers
asked by
Michelle
551 views
Predicting
Table of radioactive isotopes below Isotope type of decay Uranium-238 Alpha Nickel-63 Beta Iodine-131 Beta Radium-226
2 answers
asked by
Andrean
547 views
The half -life of carbon-14 is 5,730 years.how much of an initial amount of this substance would remain after 17,190 years(3
2 answers
asked by
Eileen
558 views
If the half life of Iodine-131 is 8.10 days, how long will it take for 120.0 g to decay to 7.50g?
2 answers
asked by
Jacob
533 views
In the radioactive formula
235 U → 235 Np + X, what does X represent 92 93 A. An Alpha Particle B. A positron C. An electron D.
4 answers
asked by
J. J.
542 views
The half-life of carbon-14 is 5730 years. How much of a 50 g sample of carbon-14 is present after 11,460 years?
2 answers
asked by
Kareem
559 views
a) 45.02% of the sample remains after 85 days. Consider how you can use the percent of Ir-192 remaining and the number of days
4 answers
asked by
ACDub
554 views
Calculate the time in which the activity of an element is reduced to 90% of its original value. The half-life period of the
2 answers
asked by
Harsh
531 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
2 answers
asked by
gary
533 views
Iron-53 has a half-life of 8.51 minutes. After 15.0 minutes, 132 mg remain from the original sample.
a) What was the original
1 answer
asked anonymously
39 views
An artifact was found and tested for its carbon-14 content. If 74% of the orginal carbon-14 was still present, what is its
2 answers
asked by
Kim Johnson
533 views
In how many years will a 80 mg of sample of C14 with t1/2 5760 years be reduced to 20 mg
2 answers
asked by
Uzma Amin
499 views
I need to know how much of a 2g sample of Technetium-99 would be left after 12 hours.
The half life of Technetium-99 is 6 hours
2 answers
asked by
Victoria
505 views
An artifact was found and tested for its carbon-14 content. If 79% of the original carbon-14 was still present, what is its
3 answers
asked by
can some please help me with this one
525 views
The half-life of tritium is approximately 12 years. What will be the molar ratio of tritium to helium-3 in a sealed sampel after
2 answers
asked by
Laura
533 views
isotope A require 12h for its decay rate to fall to 1/64 of its intial value . isotope B has half-life = 1.5 half life of A
how
2 answers
asked by
ahmed
509 views
An artifact was found and tested for its carbon-14 content. If 75% of the original carbon-14 was still present, what is its
2 answers
asked by
gary
540 views
please help me ...Experiments show that radium at rate proportional to the amount of radium present at the moment . if half life
2 answers
asked by
NOEL
529 views
235.over.92U + 1.over.n ---> 90.over.38Sr + 3 1.over.n + ??
7 answers
asked by
Gman
501 views
You have just isolated a new radioactive element. If you can determine its half-life, you will win the Nobel Prize in physic.
2 answers
asked by
Eric
511 views
An artifact was found and tested for its carbon-14 content. If 84% of the original carbon-14 was still present, what is its
3 answers
asked by
Anonymous
514 views
A uranium nucleus
238 U may stay in one piece for billions of years, but sooner or later it decays into an α particle of mass
2 answers
asked by
Anonymous
507 views
caffeine has a half-life of 4.6 hours in the human body.. How long would it take 125 milligrams tritium to decay to 22
2 answers
asked by
cam
509 views
The half-life of a certain radioactive material is 42 days. An initial amount of the material has a mass of 49 kg. Write an
1 answer
asked anonymously
78 views
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in
1 answer
asked by
Kally
495 views
An artifact was found and tested for its carbon-14 content. If 75% of the original carbon-14 was still present what is its
2 answers
asked by
Mary Ann
501 views
Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced
5 answers
asked by
Jane
506 views
Given a 800 mg sample of Thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in
2 answers
asked by
Lauren
496 views
The strontium-87 isotopes stores in the body and decays by the process shown below. The half-life is 2.80hr. Suppose that 0.766
3 answers
asked by
Morgan
498 views
A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the
2 answers
asked by
Matthew
505 views
if a egyptian mummy has 61% carbon-14 how long ago was it buried?
Take a 100 g initial sample. Now there are 61 g C-14. Use
1 answer
asked by
courtney
492 views
The level of thorium in a sample decreases by a factor of one-half every 4.2 million years. A meteorite is discovered to have
2 answers
asked by
south
495 views
If a radioactive sample has an activity of 8.33 Bq, how many disintegrations per second are occurring?
2 answers
asked by
bekah
492 views
A radioactive substance decays from 2.0kg to 1.6kg in 156 days.
What is the decay constant and the half life of the substance?
3 answers
asked by
Alice
519 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
Michael
491 views
An atomic nucleus at rest decays radioactively into an alpha particle and a different nucleus.
1 answer
asked by
Anonymous
488 views
A mosquito fed on a solution containing phosphorous-32 is released. Phosphorous-32 has a half-life of 14 days. When the mosquito
2 answers
asked by
Victoria
482 views
The half life of iodine - 131 is 8 days. How long will it take for 7/8 of the sample to decay?
2 answers
asked by
George
478 views
The half-life of 232Th is 1.4 * 10^10. Find the number of disintegrations per hour emitted by 1 mil of 232Th in 1 min.
2 answers
asked by
Nic
478 views
If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years?
2 answers
asked by
g
459 views
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below
1 answer
asked by
Tom
481 views
Radioactive decay is a process that follows first-order kinetics. The half-life of 32P is 0.03920 years; how long (in minutes)
3 answers
asked by
sara
485 views
The half-life of 234U, uranium-234, is 2.52 multiplied by 105 yr. If 98.8% of the uranium in the original sample is present,
2 answers
asked by
Anonymous
475 views
If the half life of Pu-239 is 2.4 x 10^4 years, how many years are required for a 20-gram sample of plutonium-239 to be reduced
2 answers
asked by
Please help
467 views
Explain how knowing the half life of the element lokium would help determine the exact age of rock in which this element is
1 answer
asked anonymously
51 views
A specimen has .625 the amount of carbon 14 you would find in a living specimen.
How many half-lives has the specimen been
1 answer
asked by
Chris
474 views
11. If 238U92 emits successively four alpha particles two beta particles, what will be the atomic number and mass number of the
3 answers
asked by
paresh Ghosh
487 views
It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope to decay to 0.121g. What is the half-life of this isotope?
1 answer
asked by
Shay
465 views
A radioactive nucleus at rest decays into a second nucleus, anelectron, and a neutrino. The electron and neutrino are emitted
1 answer
asked by
nammilee_2012
461 views
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