After 90 years, 20 % of a radioactive material decays. What is the half-life?
Q: A radioactive material produces 3.522E+3 decays per minute at one time, and 5.47 h later produces…
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Q: A sample of radioactive material contains 1x 1014 atoms and has an activity of 6.3 x 1011 Bq. What…
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Q: it has taken 30 days for a particular nuclide to decay to 25% of its original activity. what is the…
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Q: unknown radioactive element decays into non-radioactive substances. In 480 days the radioactivity of…
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Q: A radioactive sample containing approximately 6.52×10¹3 radioactive nuclides has a half-life of 5730…
A: Radioactive nuclides are those nuclides that are unstable. This happens due to the mismatch between…
Q: The half-life of a particular element is 330 days. What is its decay constant?
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Q: 75% of a quantity of U-232 remains after 30 years. What is the half-life?
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Q: A radioactive sample contains 2048 nuclie. How many of its nuclei decay after two half lives?
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Q: The half-life of a radioactive isotope is known to be exactly 1 h. a) What fraction of a sample…
A: Given in question - Half-life (T) = 1 hour Solution: Step1 - Here we will understand the concept…
Q: A nuclide whose "generic" symbol is 6430X would have protons and neutrons.
A: The generic symbol of a nuclide is given as X3064.
Q: What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?
A: Time=7 half life
Q: What fraction of radioactive nucleus sample survive after two half-lives?
A: Half-life is the time taken by the radioactive element to become the half of the original amount as…
Q: 8. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock…
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Q: A radioactive material produces 4.386E+3 decays per minute at one time, and 7.57 h later produces…
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Q: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…
A: To the nearest hour, the radioactive half-life of the substance is 52.5hours
Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…
A: The amount remaining is equal to the original amount times 1/2 raised to the of half-lives that have…
Q: radioactive substance has a half life of 2120 years. A) Determine the rate constant for the decay…
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Q: A radioactive sample has a half-life of 28 mins. If the initial amount of sample was 2 g, estimate…
A: Radioactive decay takes place when an atomic nucleus becomes unstable. The rate of decay is known as…
Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…
A: Given that, Half life of the isotope, T = 140 days We know that, The half life is the time in…
Q: Xe-124 an isotope of xenon has the highest half-life of 1.8 × 1022 yrs. Estimate the time it would…
A: When a nucleus becomes unstable it will undergo radioactive decay to attain a stable configuration.…
Q: Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining…
A: Potassium-argon dating is an interesting way to measure the age of rocks formed from cooled lava. It…
Q: A pure sample of a newly discovered radioactive isotope is discovered. It has a half-life of 78 y.…
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Q: the decay of a radioactive material has a count rate is 2000 decays/min. 4 hours later, the decay…
A: Given:- the decay of a radioactive material has a count rate is 2000 decays/min. 4 hours later, the…
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- The amount of carbon-14 found in a fossil of a tree is around 0.05% when compared to fresh wood of the same kind. Estimate the age of the fossil.A certain radioactive isotope has a decay constant of 0.00324 s-1. 1) Find the half-life in seconds. (Express your answer to three significant figures.) 2) Find the half-life in days. (Express your answer to three significant figures.)A dose of 8.60 mCi of a radioactive isotope is injected into a patient. The isotope has a half-life of 3.0 h. How many of the isotope parents are injected?
- The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours. Calculate the half-life of the nuclide.You inherit 32 kg of cesium-136 after your roommate moves out and leaves it behind. Cesium-137 has a half-life of 30 years. If you pack it in a box and forget about it, but your grandchildren finds it in the attic 90 years from now, how much of the sample is still cesium-137?A radioactive sample took 10 years to reach 25% of its initial amount. Estimate the half life of the material.