If a radioisotope's half-life is 2 minutes, after two half-lives there is left   0% of the original sample   75% of the original sample   50% of the original sample   25% of the original sample

Q: The half-life of cobalt-60 is 5.26 years. If 50 g are left after 15.78 years, how many grams were in…

A: The  formula that relates the mass remaining of the radioisotope to the original mass is given below…

Q: Iodine-131 has a half life of 8.0 days determine how many days must elapse for a 0.80 mg sample of…

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Q: A. time for amount of radionuclide to decrease to 1/16 of initial amount radionuclide initial…

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Q: While exploring a coal mine, scientists found plant fossils which had been preserved by an…

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Q: A 116.8 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: Given- Initial amount=116.8ng Final amount=14.60ng Time=47days

Q: A sample of 113mIn has a half-life of 100. minutes. What amount of 113mIn remains (in CPM) if a…

A: Like chemical reactions, nuclear reactions are type of chemical reaction only but here in place of…

Q: Determine the half-life of a radionuclide if after 18 days the fraction of undecayed nuclides…

A: Half-life (t1/2) represents the amount of time at which the concentration of the radioactive nuclide…

Q: Nickel-56 decays with a half-life of 6.075 days. After 5.69 hours, a radioactive nuclide has passed…

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Q: Calculate the half-life of a radioisotope if it takes 72 years for a sample to decay to 12.5% of its…

A: 100 % to 50 % one t1/2. 50 % to 25 %  second t1/2. 25% to 12.5 third t1/2. three t1/2 = 72 years.…

Q: Suppose that 10 units of beryllium are present in a living organism and that the half-life of…

A: Here i have calculated the age of material

Q: .6. A sample of (_16^35)S, a ß- emitter, has an activity of 0.100 µCi. In 20.0 days, the activity of…

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

Q: Iodine (131 I)  is used in diagnostic and therapeutic techniques in the treatment of thyroid…

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Q: life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.330 is…

A: The answer is given as follows

Q: The half-life of Po-218 is 3.05 minutes. How many minutes does it take for a sample of Po-218 to…

A: Given: Half-life of Po-218 = 3.05 minutes. And the final amount of Po-218 isotope remaining = 2.35 %…

Q: a 45.91 mg sample of a pure radioisotope has a half-life of 52 days, what will be the mass of the…

A: Given 45.91 mg sample of a pure radioisotope has a half-life of 52 day mass of the original…

Q: How many half-lives have passed in each of the following situations? (a) Initially the sample is…

A: SOLUTION: Step 1: (a). Half-life is the interval of time required for one-half of the atomic nuclei…

Q: An unknown radioactive substance has a half-life of 3.20 hours. If  20.8 g of the substance is…

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Q: A fossilized bone is found to contain 1/1000 the original amount of C – 14. Determine the age of the…

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Q: sample

A: We will calculate t1/2 by the help of given information

Q: After 3 half-lives, the activity of a radioisotope drops to _____ of the original. Group of answer…

A: We have to predict the activity with respect to original activity.

Q: Calculate the half-life of a radioisotope if it takes 144 years for a sample to decay to 12.5% of…

A: N = 0.125 No N/No = 0.125

Q: The amount of a radioisotope that remains after two half-lives have passed is:

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Q: A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater…

A: The radioactive decay follows first-order kinetics. We know that the half-life of carbon-14 is 5730…

Q: The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a sample containing 728-g…

A: Known: Half-life  = 8.0 days Original mass = 728 g Time elapsed = 6.86 weeks = (6.86 ×7)…

Q: Archaeologists used pieces of burned wood, or charcoal, found at the site to date prehistoric…

A: Given data is as follows: The initial amount of C-14, A° = 100 The amount left after time "t" , A=…

Q: 44 of 48 If the half-life of a radioisotope is 3 years, the radioactivity remaining in a sample of…

A: (a) the half life is 3 year, Now, amount of sample remaining after 6 years is, 6 years means 2 half…

Q: After 24 days, 2.0 mg of an original 128 mg sample remain. Find the half-life of the sample. a. 2…

A: Given: Initial amount of sample = 128 mg Remaining amount of sample = 2.0 mg Time elapsed = 24 days

Q: Archaeologists used pieces of burned wood, or charcoal, found at the site to date prehistoric…

A: Given, half life of C-14 = 5730 years. Exponential decay equation : A(t) = Ao ekt Since half life is…

Q: A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: A sample has a half life of 100 years. If it has been 200 years since it started to decay and there…

A: The question is based on the concept of chemical kinetics. we have to calculate initial mass of the…

Q: A 50.0g sample of nitrogen-16 takes 14.4 second to decay to a mass of 12.5G. Calculate the half life…

A: Given: The time taken by N-16 to undergo decay, t = 14.4 sec The initial amount of N-16, No = 50.0 g…

Q: sample of Uranium ore is estimated to have originally contained 805 mg of uranium-238. Analysis…

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Q: It is well known that any radiocarbon takes several decades to disintegrate. In an experiment, only…

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Q: IUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

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Q: radioisotope tracer has a half-life of 1.5 minutes. If a level of <1% is considered safe, when would…

A: Half life of a radioactive isotope is the amount of time it takes for one half of the radioactive…

Q: The half life of a specific radionuclide is 8 days. How much of an 80mg sample will be left after 24…

A: There are two methods to solve it : Method (1): The half life is the time in which any compound is…

Q: The half-life of radium-226 is 1.8x103 years. How many hours will it take for a 2.50-gram sample to…

A: Interpretation-  To determine how many hours will it take for a 2.50-gram sample to decay to the…

Q: Calculate how long will it take for a sample of a radionuclide with a half-life of 39.9 days decay…

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Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

A: Given :

Q: The half‑lives of different medical radioisotopes are given in the table. If the initial amount of…

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Q: he half-life of chromium-51 is 28 days. If the sample contained 510 grams, how much chromium would…

A: Given that

Q: The accompanying figure illustrates that after two half-lives, ____ percent of the parent…

A: It is given a graph of half-life at x-axis and parent isotope remaining in percentage at the y-axis,

Q: If 1.50 gram of a 2.00 gram sample of a radioactive substance undergoes decay in 60 minutes, then…

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Q: A 10.00-g plant fossil from an archaeological site is found to have a 14C activity of 3094…

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Q: Technetium‑99m, an important radionuclide in medicine, has a half‑life of 6.0 hours. What percentage…

A: Given  Half life ( t1/2 ) = 6 hours

Q: Calcium – 47 has a half-life of 4.5 years . How long will it take a 100 mg sample to drop to 12.5…

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Q: Carbon-14 Half-Life 120 100 80 60 40 20 5000 10000 15000 20000 25000 80000 Time in Years If a…

A: The fossilized bone is found 1/8 ratio of carbon-14 to carbon-12. The approximate age of the bone…

Q: A 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took 245 days…

A: Given, A 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took…

Q: Hydrogen-3 is radioactive and has a half life of 12.3 years. How long would it take a sample to…

A: Given that -  Hydrogen-3 is tritium which is a radioactive isotope with half life = 12.3 years…

Q: radionuclide time for amount of initial radioactivity radionuclide to decrease to 1/4 of initial…

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