The accompanying figure illustrates that after two half-lives, ____ percent of the parent radioisotope has decayed.   50   0   75   25   100

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: Technetium-99m, a metastable state of technetium-99 commonly used in nuclear medicine, has a…

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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: The half life of a specific Tc-99m is 9 hours. How much of an 389mg sample will have decayed after…

A: Welcome to bartleby !  Introduction :  We have to calculate amount of sample decayed .

Q: A 3.6-kg laboratory animal receives a single dose of 8.92x10-4 Gy. (a) How many rads did the animal…

A: (a) Given data contains, Mass of laboratory animal is 3.6-kg. Dose received is 8.92x10-4 Gy.

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: After 4.00 years, 2,000g of a radioisotopes remains from a sample that had and original mass of…

A: There is some mistake in 1st part  If the left amount is 2.0g then half-life is itself 4 years

Q: What is the original mass of C-14 in a sample if 10.00 mg of it remains after 20,000 years? The…

A: The C-14 decays according to first order kinetics. Since we know that the relationship between the…

Q: A moisture density gauge uses à radioactive source containing the isotope Cs-137, which has a…

A: Cs-137 has a half-life of 30.17 years . Activity of the radioactive source is 8.00 mCi, when…

Q: Use the table on the right to answer the following questions. 11. How long is a half-life for…

A: Note : As per our guidelines , we are supposed to answer only subparts of first question (11 to 14)…

Q: A 3.6-kg laboratory animal receives a single dose of 8.92×10-4 Gy. (a) How many rads did the animal…

A: (a) Given data contains, Mass of laboratory animal is 3.6-kg. Dose received is 8.92x10-4 Gy.

Q: About what percentage of the original radioactive sample will be left after 8 minutes? The half-life…

A: Given,  Time = t = 8 8 minutes Half-life period = t1/2 = 2 minutes Percentage of the original…

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: Magnesium-27 is an unstable radioisotope. For it to become stable, it has to undergo

A: Mg has 27 mass no. and 12 atomic number. Hence, it has 12 protons and 27-12 = 15 no. of neutrons.…

Q: If the half-life for I-131 is 8 days and a patient is given 1.35 mg of this nucleus at 5:00 am in…

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Q: Chernobyl expelled lots of Cs-137 radioisotopes in the environment in 1986.  The half-life of Cs-137…

A: We have to calculate the radioactivity after 60 years.

Q: Select the missing product of this decay reaction: 234 Th      ?   +   0 e 90   -1

A: When radioactive element releases beta particles we get an increased atomic number element.

Q: 5.34 Fluorine-18, which has a half-life of 110 min, is used in PET scans. a. If 100. mg of…

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Q: The half-life of Po-214 is 0.001 seconds. How much of a 10 gram sample is left after 0.003 seconds?

A: Half life of Polonium, t1/2 = 0.001 second Mass of sample = 10 g

Q: Time (days) If the initial sample is 2.25 g, what mass of the original iridium-192 remains after…

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Q: The half-life of 232Th is 1.4×10 yr. Find the number of disintegrations per hour emitted by 1.0 mol…

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Q: What is the half‑life of an isotope that decays to 6.25%6.25% of its original activity in 24.2…

A: The half-life  is the time it takes for the concentration of that substance to fall to half of its…

Q: Be sure to answer all parts. A freshly isolated sample of 90Y was found to have an activity of 6.6 x…

A: Given : A1 = 6.6 ×105 per minute A2 = 1.8 × 104 per minute   Find : To calculate The half-life  is…

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: he half-life of radioactive Bk-248 is 23.7 h.   How long does it tak

A: Radioactive decay follows the first order kinetics  its decay constant   λ = 2.303t log NoNwhere…

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

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Q: A radioactive material has mean lives of 162Q year and 520 year for a and Bemission respectively.…

A: Answer to 33 Given, Mean life for α, T1 = 1620 yearMean life for β, T2 = 520 yearNNo = 14 To find-…

Q: A freshly isolated sample of 90Y was found to have an activity of 7.6 × 105 disintegrations per…

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Q: After 119 days have elapse 1/21 of a radioisotope sample remains undecayed. What is the half-life of…

A: Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A…

Q: what fraction of a radioisotope has decayed after two half-lives?

A: The time required for a quantity of a radioisotope to decay by half is known as the half-life time.…

Q: A 50 gram sample of a radioisotope undergoes 2 half-lives.  How many grams would remain at the end?

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Q: A sample of a wooden artifact gives 5.0 disintegrations/min/g carbon. The half-life of C-14 is 5730…

A: Half life is defined as the time taken by a radioactive sample to decay to half of its original…

Q: The half-life of strontium-91, is 9.70 hours. The decay constant is _____ x 10 ^-5 s^-1. For an…

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Q: Fluorine-18 decays to form a positron and oxygen-18. After 90.0 minutes, 1.00 18O is present…

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Q: after 5.69 hours, a radioactive nuclide has passed through exactly five half-lives. the initial…

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Q: If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactive…

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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: If the half life- of a 100 mg radioactive isotope is 24 hrs. How many milligrams remain after second…

A: half life- of a 100 mg radioactive isotope is 24h Half life of reaction  means the time at which the…

Q: Please use the values in the Technetium-99m has a half life of 6.01 hours. If a patient injected…

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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: Part A: In the reaction shown, three half-lives have passed Part B The half-life of phosphorus-32…

A: Interpretation -  As in the reaction shown that three half lives are passed if the half life of…

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: SW Science 10 Unit 5 Radioactive Decay Worksheet Name:asmin laward th Student #: 5.2.1 Radioactive…

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Q: A radioactive sample has a decay constant of 1.32 x 10-3 h-1. What is its half life?

A: Radioactivity is a first order kinetics. Relation for decay constant ( λ) and t1/2 relation for…

Q: time for amount of initial radioactivity radionuclide to decrease to 1/16 of initial amount

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Q: How old is a rock if the mineral biotite from the rock has 25,000 40K atoms and 75, 000 40Ar atoms?…

A: Every atoms of Ar produce from k. Answer 2.6 days