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Radioactive Decay
Page 9
Questions (597)
A radioisotope has a neutron/proton ratio which is too low. Which of the following processes will not occur for such a nucleus?
4 answers
asked by
mali
758 views
(a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it
2 answers
asked by
Simon
789 views
Po-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 56 mg of Po-218, how many alpha emissions would
4 answers
asked by
sara
758 views
Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react w/ nitrogen to produce radioactive carbon-14.
2 answers
asked by
John
754 views
The half-life of polonium-218 is 3.0 minutes. If you start with 30.0 g, how long will it be before only 1.1 g remains?
2 answers
asked by
Anonymous
756 views
How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?
2 answers
asked by
bekah
744 views
Radioactive materials are often used in biological studies. A radiation biologist studies the rate of decomposition of a certain
2 answers
asked by
L
742 views
If half life of iodine 131 is 8 days, how much from 32g remain after 40 days (5 half lives).
2 answers
asked by
henry
748 views
Suppose a sample of Cesium-137 with initial mass of 200 grams decays to a mass of 160 grams voer the course of 10 years.
Find the
2 answers
asked by
Melanie
771 views
Starting with 100 grams of uranium-238, after one half life has gone by, how many grams of uranium-238 will remain?
2 answers
asked by
Lamont Sanders
761 views
A sample of radon has an activity of 80,000 Bq. If the half-life of radon is 15 h, how long before the sample's activity is
2 answers
asked by
bekah
719 views
The half-life of radon-222 is 3.8 days. How much of a 300 gram sample is left after 14.8
days?
2 answers
asked by
Anonymous
718 views
An atomic nucleus at rest decays radioactively into an alpha particle and a nucleus smaller than the original. What will be the
2 answers
asked by
kassy
711 views
What happens to the atomic number of the daughter nucleus if it is formed after the emission of the beta particle?
The atomic
3 answers
asked by
wtewt
722 views
a) Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay).
1 answer
asked by
brett
712 views
Potassium-42 has a half-life of 12.4 hours. How much of a 1600g sample of potassium-42 will be left after 36.0 hours?
3 answers
asked by
Giovanni
690 views
1.a radioscope which is neutron poor and very heavy is most likely to decay by?
alpha , beta, electron capture, positron emission
2 answers
asked by
keith
710 views
Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all
4 answers
asked by
Student101
691 views
the rubidium isotope 87Rb is a beta emitter with a half-life of 4.9E10 y that decays into 87Sr. It is used to determine the age
1 answer
asked by
Star
686 views
A plant fossil lost 40 % of its carbon-14. How old is the fossil? (Half-life of carbon-14 is 5730 years.)
1 answer
asked by
meriton
663 views
A pion has rest energy 135MeV. It decays into two gamma rays that travel at the speed of light. A pion
moving through the lab
1 answer
asked by
Pardis
674 views
The half-life for the process 238Uā206Pb is 4.5Ć109yr. A mineral sample contains 67.0 mg of 238U and 16.5 mg of 206Pb.
What is
6 answers
asked by
Lm17
673 views
The half-life of radon-222 is 3.8 days. How much of a 300 gram sample is left after 14.8 days?
2 answers
asked by
Anonymous
656 views
With a half-life of 14.3 years, how long will it take for100 g of phosphorus32 to decay to 12.5 mg?
1 answer
asked by
thomas
649 views
Hello! I need help with some Science things.
1. Where is a good place to find a picture that describes radioactive decay, fussion
3 answers
asked by
Amy
652 views
A radioactive isotope of radium (Ra-226) has a half-live of 1620 years. How much of this isotope remains after three (3)
1 answer
asked by
louren
656 views
A radioactive element x has half life of 30 days and will decay to become another new element Y..
a) calculate decay constant b)
2 answers
asked by
Aboi
655 views
The age of a rock can be estimated by measuring the amount of 40Ar trapped inside. The calculation is based on the fact that 40K
3 answers
asked by
Matt
646 views
a student in Greece discovers a poetry bowl that contains 28% of its original amount of c-14
2 answers
asked by
rebecca
610 views
Use an analogy from everyday life that can define the term half-life
2 answers
asked by
Nikkie
633 views
3. The three major types of radioactive decay of an unstable nucleus are alpha particles, beta particles, and gamma rays.
Compare
2 answers
asked by
sam
637 views
Living organisms give a Carbon-14 decay rate of 15.3 counts/min for each gram of carbon in the sample. A sample of bristle cone
2 answers
asked by
Rad
637 views
Iodine-131 has a half life of eight days. What mass of iodine-131 would remain from a 20g sample after 32 days?
2 answers
asked by
jezebel
635 views
3.Using the curve that you constructed for the decomposition of Carbon 14, find the age of a prehistoric cave painting
1 answer
asked by
Pera
609 views
there are 500g of cobalt to 60 that has a half life of 5years ,how many grams of cobalt are remained after 15years
2 answers
asked by
Anonymous
593 views
Iron -59 has a half life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that a new sample of iron? Show all
3 answers
asked by
noemi/
609 views
Radioactive waste is difficult to dispose of due to the long time periods needed before the radiation effectively disappears.
2 answers
asked by
danny
624 views
The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of
2 answers
asked by
leon
603 views
The nucleus shown undergoes beta-minus decay.
131 53I How many protons will the nucleus have after it decays? (1 point) Responses
1 answer
asked anonymously
32 views
A radioactive element x has half life of 30 days and will decay to become another new element Y..
a) calculate decay constant b)
3 answers
asked by
Aboi
599 views
the half-life of tritium is 12.26 y
what would be the decay of tritium atoms per second in 1.00 L of hydrogen gas at STP
2 answers
asked by
kiloa
569 views
only 5% of the carbon-14 in a small wooden bowl remains , how old is the bowl?
Hint, half-life for carbon ā14 us 5730 years
3 answers
asked by
martha
586 views
The half live of Iodine-131 is 8 days. if you started out with 40 mg sample of iodine-131, then what would be the mass of the
3 answers
asked by
Massiel
598 views
A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted,
2 answers
asked by
jill
602 views
Nuclear Processes Unit Test
12 of 1812 of 18 Items Question In which type of radioactive decay does the nucleus become more
1 answer
asked anonymously
50 views
If the following element undergoes alpha decay, which element does it change into? a Uranium (U) b Francium (Fr) c Radium (Ra) d
1 answer
asked by
cyan
36 views
A radioactive isotope has a half life of 25 years. There was 100 mg of the isotope in 2005.
(a) Find an expression for the amount
4 answers
asked by
Anonymous
581 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?
5 answers
asked by
Marty
580 views
A particular radioactive substance has a half-life of 4 minutes. How long will it take for 250 g of this radioactive material to
2 answers
asked by
Anonymous
570 views
The half-life of Th(227) is 18.72 days. It decays by alfa emission to Ra(223), an alfa emitter whose half-life is 11.43 days. A
2 answers
asked by
Mag
578 views
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