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What does it mean to have a half-life of 30 years?
Physical Half Life is the time for a quantity of radioisotope to decay by half (Cs-137 = 30 years) Biological Half Life is the time for 1/2 of the amount of a radionuclide to be expelled from the body (CS-137 = 70 to 100 days)
What is the half-life of isotope X?
2.0 years
The half-life of isotope X is 2.0 years.
What element has a half-life of 30 years?
Half-lives of isotopes commonly used in GCSE questions
| Isotope | Half-life |
|---|---|
| Uranium-235 | 704 million years |
| Plutonium-239 | 24,110 years |
| Carbon-14 | 5,730 years |
| Caesium-137 | 30 years |
Which of the following is a radioactive element?
Radioactive Elements
| Element | Most Stable Isotope | Half-life of Most Stable Isotope |
|---|---|---|
| Polonium | Po-209 | 102 years |
| Astatine | At-210 | 8.1 hours |
| Radon | Rn-222 | 3.82 days |
| Francium | Fr-223 | 22 minutes |
Which of the following Cannot be emitted in radioactive decay of a substance?
Protons cannot be emitted by radioactive substances during their decay.
What radioactive isotope has the shortest half-life?
Uranium-234 has the shortest half-life of them all at 245,500 years, but it occurs only indirectly from the decay of U-238. In comparison, the most radioactive element is polonium.
What radioactive element has the longest half-life?
Bismuth
Bismuth breaks half-life record for alpha decay. Physicists in France have measured the longest ever radioactive half-life – over twenty billion billion years – in a naturally occurring element that decays by emitting alpha-particles.
Which radioactive element has the longest half-life?
What is the half life of a radioactive isotope?
Each radioactive element has a different half life decay time. The half-life of carbon-10, for example, is only 19 seconds, so it is impossible to find this isotope in nature. Uranium-233 has a half-life of about 160000 years, on the other hand.
What is the half-life of carbon-10?
The half-life of carbon-10, for example, is only 19 seconds, so it is impossible to find this isotope in nature. Uranium-233 has a half-life of about 160000 years, on the other hand. This shows the variation in the half-life of different elements. The concept if half-life can also be used to characterize some exponential decay.
What is the half-life of the decay of radioactive cesium?
The half-life of the decay of radioactive cesium (134) has been reported to be 2.062 years. What fraction of the original radioactivity will remain after 67 months? A fossil fuel contains 70\% of the carbon-14 it once had as a living creature. How would you use the half-life decay equation to determine when the creature died?
What is the formula for nuclear half-life?
Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay. Exponential decay can be expressed mathematically like this: #A(t) = A_0 * (1/2)^(t/t_(“1/2”))# (1), where. #A(t)# – the amount left after t years;