A sample of radioactive material has a half-life of 12 hours. If the initial sample contained 6.2x1013 radioactive nuclides estimate the number of radioactive nuclides present in the sample after 5 hours.
Q: The nuclide 14C contains (a) how many protons and (b) how many neutrons?
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Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…
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Q: After 1.82 days, the activity of a sample of an unknown type radioactive material has decreased to…
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Q: A radioactive isotope has a half-life of 72.0 min . A sample is prepared that has an initial…
A: (a) Initial radioactive nuclei
Q: After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to…
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Q: How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an…
A: No = 192 cpmN = 3 cpm
Q: If 100 grams of a radioactive substance is left to decay, how much would be left after 5 half-lives?…
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Q: Many medical PET scans use the isotope 18F , which has a half-life of 1.8 h . A sample prepared at…
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Q: Your company develops radioactive isotopes for medical applications. In your work there, you measure…
A: We know, the activity equation is given by A=A0e-λt From the table it is seen that A0=20,000 At…
Q: What fraction of a radioactive sample is left after exactly 6 half lives? Give your answer to 3…
A: Number of half life (n) = 6
Q: A radioactive sample is observed for 160 days. After 160 days the amount of the sample is found to…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The rate at which this…
Q: The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. s -1…
A: Given data: The half life of randon-222 is t1/2=3.823 days=330307.2 s Part a: The expression for…
Q: A certain isotope has a half-life of 6.4 h and an atomic mass of 87.29 u. What will the activity in…
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Q: Choose the BEST answer to the following. A radioactive sample has a half-life of 1 hour. Starting…
A: The number of half -life passed in a time is,
Q: unknown radioactive element decays into non-radioactive substances. In 480 days the radioactivity of…
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Q: A radioactive sample is observed for 5 days. After 5 days the amount of the sample is found to be…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The rate at which this…
Q: The half-life of 131I is 8.04 days. (a) Convert the half-life to units of seconds. s (b) What is…
A: As per guidelines , only 3 subparts are solved here. The half-life of 131I is 8.04 days. (a) 1 days…
Q: Suppose Radon gas is trapped in a basement after renovations. The half life of radon gas Is 3.8235…
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Q: What nuclide is produced in the following radioactive decays? (a) a decay of 239 94 Pu; (b) b- decay…
A: Part(a): The Alpha decay means the extraction of 2He4 nucleus from a radioactive atom. The alpha…
Q: In a lab a radioactive sample is studied for 5 days. It was observed that the radioactive nuclides…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The decay process is…
Q: A radioactive sample studied in a lab is found to have a half-life of 48 hours. If the initial…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The half-life for a…
Q: Use the equation for radioactive decay and solve for an algebraic expression for the time, “t” in…
A: Heavier nucleus are unstable. This is because there is increase in number of protons. This increase…
Q: Tritium has a half-life (half-life) of 12.33 years. In a sample of tritium, what percentage of 3H…
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Q: Use the following data to calculate the binding energy per nucleon in MeV of the Rhodium-103 nuclide…
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Q: For the radioactive isotope strontium-90, k is 2.47 x 10-2 years -1. If the original amount of…
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Q: A sealed box containing alloys of metal A and Metal B consisting of the same parts accordingly.…
A: We need to find the age of the alloy based on the given information.
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: A radioactive sample is prepared; 10.78 hours later, only 1/16th of the original sample remains.…
A: Activity N=N0e-λt 10.78 hours later, only 1/16th of the original sample remains N016=N0e-λ10.78…
Q: A 10 g sample of a radioactive element took 12 days to reduce into 1 g. Calculate the half-life and…
A: Some configurations of protons and neutrons inside a nucleus are unstable. When an atomic nucleus is…
Q: A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity…
A: Given Data: The half-life of a radioactive isotope is, t1/2=72.0 min The initial activity is,…
Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…
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Q: A radioactive sample studied in a lab is found to have a half-life of 25 hours. If the initial…
A: Radioactive decay is the process by which an unstable atomic nucleus spontaneously emits particles…
Q: A 5 g sample of a radioactive element takes 102 days to reduce into 3 g. Calculate the half-life and…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: an element with initial mass 1 kg started radioactivity in 2021 , in which year the element will…
A: The mass is proportional to the radiation concentration. Which means that the radiation equation can…
Q: building has become accidentally contaminated with radioactivity. The longest-lived material in the…
A: Answer is 1685.2 years
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- Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about aday, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of thesetwo nuclides. If the mixture is such that the activities arising from X and Y are initially equal,then a few days later the activity of the sample will be due ………………………………… .i. predominantly to X.ii. predominantly to Y.iii. to X and Y equally.iv. entirely to Y.20.0 hours after being ingested 74.5 % of the original radioactive atoms have decayed or been eliminated. If the biological half-life is known to be 35.0 hours, what is the physical half-life of this isotope? State the time in hours to 1 decimal places but do NOT include units in your answer. Your Answer:The remains of an ancient cave were unearthed. Analysis from charcoal in the cave gave 12.0 disintegration/min/g of carbon. The half life of C-14 is 5730 years. Analysis of the tree cut down when the cave was unearth showed 22.1 disintegrations/min/g of carbon. How old are the remains in the cave?
- The half-life of 1311 is 8.04 days. (a) Convert the half-life to seconds. S (b) Calculate the decay constant for this isotope. S-1 (c) Convert 0.570 μCi to the SI unit the becquerel. Bq (d) Find the number of 13¹1 nuclei necessary to produce a sample with an activity of 0.570 μCi. 1311 nuclei (e) Suppose the activity of a certain 13¹1 sample is 6.90 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.) half-lives mCiThorium 22890Th produces a daughter nucleus that is radioactive. The daughter, in turn, produces its own radioactive daughter, and so on. This process continues until bismuth 21883Bi is reached. What are (a) the total number Nα of α particles and (b) the total number Nβ of β- particles that are generated in this series of radioactive decays?The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. 2.1x10-65-¹ ✓ (b) What percentage of a sample remains undecayed after two weeks (1.21 x 106 s)? %
- Time 0 t₁2 20₁2 3₁/12 Number of nuclides, N x 10³ 1000 750 500 90/2 10/₁2 250 125 0 12 212 312 412 512 612 7h2 8h2 9h12 10/2 Time in multiples of t₁/2 The figure shows a typical radioactive decay (amount of undecayed nucleus (N) vs. time (t)) from a heavy nucleus. Such a decay may be best expressed by an equation like : ON = N₂ (xt) ON=N₂/λt -λt ON = N₂e N = N₂ e-1/At N 1,000,000 500,000 250,000 125,000 62,500 31,250 15,625 7,813 3,906 1,953 977 412 5/₁/2 61₁2 7h2 81/2If the activity of a sample of radioactive material is initially 10 Ci and the half-life of the material is 1.2 hour. What is the activity after 4.2 hours?