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What is the percentage of radioactive nuclei left after 3 half lives have passed?
Wiki User
∙ 12y ago
12.5%
Kennedi Ratke
Wiki User
∙ 13y agoDuring the first half life, half of the radioactive substance decays. During the second half life, half of what is left decays; since this is half of the original amount, a quarter of the original radioactive material decays away, and a quarter remains. During the third half life, half of what is left decays; since this is a quarter of the original amount, an eighth of the original radioactive material decays away, and an eighth remains.
Wiki User
∙ 12y ago1/23 = 1/8 = 12.5%
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After 6 half-lives What percentage of a radioactive sample remain?
After 6 half lives, the remaining will be (1/2)6 i.e 1/64 th of the initial amount. Hence by percentage it would be 1.5625 %
Should Radioactive isotopes used for medical purpose have long lives?
Radioactive isotopes used for medical purpose should not have long lives. The imaging cameras need to pick up the particles from the decay of the radioactive nuclei, and having a lot within an hour or two means a short half-life.
Do radioactive isotopes need thousands of years to decay?
Half-lives of radioactive isotopes are between several nanoseconds and more than 10e22 years.
What is the difference between radioactive and non-radioactive isotope?
Radioactive minerals are unstable and emit radiation at a constant rate. They also have half lives and lose energy overtime. Nonradioactive minerals are stable, and by there own are incapable of emitting energy.
Is samarium radioactive?
There are seven naturally occurring isotopes of samarium (Sm), and they are Sm-144 Sm-147, Sm-148, Sm-149, Sm-150, Sm-152 and Sm-154. Samarium's radionuclides Sm-147, Sm-148, and Sm-149 are alpha emiters. That is, they emit helium nuclei. The other isotopes are stable. A link can be found below.
What is the percentage of radioactive nuclei left after 3 half-lives have passed?
12.5%
What fraction of a radioactive nuclei remain after p half lives?
The remainder is 2-p or 0.5p of the original amount.
What percentage of a radioactive sample remains after 5 half-lives?
3.1 %
What percentage of a radioactive element will remain after seven half lives?
1/27 = 1/128 = 0.78125%
How many half-lives have passed for 50 percent of the original radioactive material?
One half-life.
How many half-lives have passed in a rock containing one eighth of the original radioactive material and seven eighths of the daughter product?
3 half-lives
After 6 half-lives What percentage of a radioactive sample remain?
After 6 half lives, the remaining will be (1/2)6 i.e 1/64 th of the initial amount. Hence by percentage it would be 1.5625 %
Why are the nuclei of elements with atomic numbers greater than 82 naturally radioactive?
Massive nuclei are unable to remain bound aganst the repulsive force of their protons, which all have positive charge. This also occurs with elements #43 (technetium) and #61 (promethium) which because of their particular nuclear geometry are inherently unstable and radioactive, with the only natural isotopes having half-lives of just over 2 years.
Calculate how many half lives have passed in a rock containing one-eighth the original radioactive material and seven eighths of the of the daughter product?
1/8 = (1/2)3 which is in the form (1/2)n where n is the number of half lives undergone. Therefore the substance has passed three half lives
Can all radioactive isotopes be used in radiometric dating?
No, not all radioactive isotopes be used in radiometric dating. Some have very very short half lives and would entirely disappear before any useful period of time passed.
After three half lives have passed how much of the original radioactive material will remaim?
1/8th gram will be left. That's your answer.
What are the release dates for I Led 3 Lives - 1953 Radioactive 3-28?
I Led 3 Lives - 1953 Radioactive 3-28 was released on: USA: 1956
