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Radioactivity
Page 7
Questions (539)
The half-life of is 30.0 days. What fraction of a sample of this isotope will remain after 16.2 days?
3 answers
asked by
sarah
1,130 views
Answer all questions.
Question 1 A decay that involves a high-speed electron is a(n) ____________________ decay a) α particle b)
3 answers
asked anonymously
41 views
How much of a radioactive substance remains after three half-lives?
a) one third b) one half c) one quarter d) one eighth e) one
1 answer
asked anonymously
48 views
Q1. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The
3 answers
asked by
Trixie
1,092 views
The half-life of Radium-223 is 11.43 days. If a sample has a mass of 400 mg, find the mass (in mg) that remains after 6 days
2 answers
asked by
w
1,029 views
Suppose you had a detection device that could count every decay event from a radioactive sample of plutonium-239.052156 (t1/2 is
1 answer
asked by
Maryanne
1,029 views
You have 11.20 grams of a compound. It is known that the compound has a half-life of 3.8 days. How long will it take for the
2 answers
asked by
Anonymous
1,028 views
The radioisotope radon-222 has a half-life of 3.8 days. How much of a 65-g sample of radon-222 would be left after approximately
2 answers
asked by
Anon
1,021 views
Iodine-131, a beta emitter, has a half-life of 8 days.How many grams of a 10.0g sample of iodine-131 would remain after 56.0
2 answers
asked by
Shay
1,016 views
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus.
2 answers
asked by
mark
1,027 views
A radioactive material has a DK constant of 0.0122. 8, million nuclei ever meaning after 15 seconds of decay what is the number
1 answer
asked anonymously
46 views
If a radioactive isotope has a half-life of 20 hours, how many half-lives have occured after 80 hours have passed?
a 3 b 5 c 4 d
1 answer
asked by
URMUM
178 views
Scientist use radioactive hydrogen to make water. They grew plants using the radioactive water.what happened to the radioactive
1 answer
asked anonymously
39 views
A smoke detector contains 0.2 mg of Americium 241 (Am-241), a radioactive element that decays in t years according to the
1 answer
asked by
Julie
1,000 views
the half life of a radioactive substance is one day. You have 100 grams. how much of the substance would be left after a week?
2 answers
asked by
Jo
951 views
When Marie Curie Isolated uranium from pitchable, she realized that the [itchable was more radioactive than the uranium she had
4 answers
asked by
jeje
941 views
what type of readioactive decay results in uranium-238 becoming thorium-234?
1 answer
asked by
yuku
925 views
a radioactive substance decays at an annual rate of 24 percent. If the initial amount of the substance is 640 grams, which of
2 answers
asked by
lilly
939 views
In 2006, Soviet dissident Alexander Litvinenko was murdered when Polonium-210 was added to his tea; he died three weeks later.
2 answers
asked by
Jessie
933 views
In eight days, a certain amount of Vanadium-48, V^48, decays to 1 over square root 2 of its original amount. What is the half
3 answers
asked by
David
958 views
The half-life of Radium-223 is 11.43 days. If a sample has a mass
of 900 mg, find the mass (in mg) that remains after 5 days
3 answers
asked by
Connor
899 views
The half life of a radioactive sample is 6.93 days.after how many days will only one -tenth of the sample be left behind?
2 answers
asked by
Mira
898 views
What can scientists learn from the rate at which radioactive elements decay?
A. a rock's absolute age* B. the relative age of
4 answers
asked by
Anonymous
893 views
Consider that the half-life of Polonium-210 is 140 days.What approximate daily percentage of decay does Polonium-210
2 answers
asked by
Tristan
885 views
a radioisotope is called a tracer when it is used to
3 answers
asked by
mia
871 views
Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t)
7 answers
asked by
Vanessa
857 views
A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. What was the identity of the original nucleus?
2 answers
asked by
Student101
854 views
A radioactive kind of nitrogen has a half life of 10 minutes. If you start with 64 grams of the substance, how much will be left
2 answers
asked by
Ana Y
848 views
3. What can scientists learn from the rate at which radioactive elements decay? (1 point)
2 answers
asked by
Nicole
831 views
if you start with 100mg of radioactive material that has a half life of one hour, how many mg's of radioactive material would
2 answers
asked by
carlos
832 views
5 mg iodine 131 its half life is 8.1 days what is the time when 1% remain
2 answers
asked by
mary
805 views
A substance has a half-life of 10,000 years and an initial mass of 1,000 grams. How many years will pass before only 250 grams
4 answers
asked by
h
1,734 views
Will you check this answer for me?
the half-life of strontium-87 is 2.8hr. What percentage of this isotope will remain after 8
3 answers
asked by
Madison
1,403 views
A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.
2 answers
asked by
Eric
816 views
The half life of a certain radioactive substance is 10 years. How long will it take for 18 gms of the substance to decay to 6
6 answers
asked by
Anonymous
816 views
A human body required 0.01 m activity of radioactive substance after 24 hours .Half li of radioactive substance is 6 hours .Then
2 answers
asked by
Aashika Jain
803 views
The half life period of radium is 1600 years.In how many years 1 gram of radium lose 1 centigram??
2 answers
asked by
Priyanka
791 views
The element strontium-90 is radioactive. The percent of strontium -90, A(t), left in a sample can be modelled by the half-life
9 answers
asked by
Emma
774 views
90Sr is one of the harmful radionuclides resulting from nuclear fission explosions. It decays by a first-order process with a
3 answers
asked by
omar
746 views
Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei,
1 answer
asked by
Anonymous
754 views
If I 131 has a half-life of 8 days, what fraction will be left after a year?
3 answers
asked by
g
726 views
Scientists used radioactive hydrogen to make water. They grew plants using the radioactive water. What happened to the
1 answer
asked anonymously
28 views
Suppose you have 100 g of radioactive plutonium-239 with a half-life of 24,000 years. How many grams will remain after (a)
1 answer
asked by
b
764 views
The half-life of Th-232 is 1.4E10. Find the number of disintegrations per hour emitted by 1 mol of Th-232.
5 answers
asked by
Nic
753 views
Radon-222 is a radioactive gas with a half-life of 4 days. Approximately how much of a 40 g sample of radon-222 would remain
1 answer
asked by
Luna
745 views
Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 hr and is a pure gamma emitter.
2 answers
asked by
Nadia
740 views
The disintegration of a radioisotope, such as I-131 to Xe-131, is another example of a first-order reaction.
It has a half-life
3 answers
asked by
Ashley
768 views
an original sample of K-40 has a mass of 25.00 grams. After 3.9x 10 to the ninth years, 3.125 grams of the original sample
2 answers
asked by
micky
750 views
A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.
2 answers
asked by
Eric
750 views
Iodine-131 has a half-life of 8 days. How many grams of a 12 g sample will remain at the end of 40 days?
how do i solve this? i
2 answers
asked by
jess
723 views
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