Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

Q: How long will it take a radioactive sample of iodine-131 (half-life 8.07  d ) to lose 99.2  %  of…

A: The given disintegration reaction is first order reaction. Half life t1/2 = 0.693 / K 8.07 days =…

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

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Q: The half-life of nucleus Rn-222 is 3.88 days. How many mg of a 5000 mg sample of Rn-222 remains…

A: The half life of a given reaction refers to the time required by a given compound to reduce to half…

Q: Iodine-131 has a half-life of 8.0 days. How long will it take 10 µg of 131I to decrease to 1/100 of…

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Q: o-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years. a) How…

A: Elements which are not stable gain stability by emitting rays, this type of elements are called…

Q: Calculate the half-life of a radioisotope if it decays to 12.5% of its radioactivity in 12 years.

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Q: Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of…

A: Half life period: The time required to decay half of the initial amount is known as half life…

Q: Fluorine-18, which has a physical half-life of 110 min, is used in PET scans. if 1.00g of…

A: The fluorine-18 sample was shipped at 5:00 PM and arrives the laboratory at 9:30 AM in the next…

Q: What is the half life of radioistope if it decays to 12.5% of its radioactivity in 12 years?

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Q: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

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Q: A patient undergoing thyroid radiotracing was initially administered with 50.0 mg of iodine-131.…

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Q: Ca-60 is used extensively in radiotherapy and its half-life is 5.27 years. How many years will it…

A: Given: half life, t12=5.27 years[A]=0.2[A]o To calculate: Years taken to decrease to 20% of its…

Q: After 119 days have elapsed, 1/12 of a radioisotope sample remains undecayed. What is the half-life…

A: Amount of radioisotopes remaining = 112 of the initial amount Number of days taken for the decay =…

Q: 6. A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the…

A: Given, Half-life - 4.5 × 109 yr. 1 mg U-238 contains 0.257 mg of Pb-206.

Q: Iodine – 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If a…

A: The radioactive decay always follows the first order kinetics. The radioactive decay of I-125 must…

Q: Given the rate constant, k, for the decay of a radioactive substance, how would you find the…

A: Given :- rate constant for decay of radioactive substance = k  To find :- half-life (t1/2)

Q: Iodine-131 has a half-life of 8.0 days. How long will it take 10 μg of 131I to decrease to 1/100 of…

A: We have given the half life of 131I that is t1/2 = 8 days from this we can find the out the decay…

Q: A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the decay…

A: The first-order rate law can be transformed into another highly useful equation with the decay…

Q: Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left…

A: Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left…

Q: What is C-14 activity in a sample that is 2.0 x 104 yr old? Assume that C-14 activity in the living…

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Q: A certain radioisotope has a half-life of 6.58 days. What percentage of an initial sample of this…

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Q: If a tree dies and the trunk remains undisturbed for 1.895 × 10ª years, what percentage of the…

A: Mass% is equal to the ratio of the mass of the given substance to the total mass of the substance.…

Q: One of the radioactive isotopes used in medical treatment or analysis is iodine-131. The half-life…

A: The relationship between the decay constant and the half-life period is given below.

Q: lodine - 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If a…

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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: Cobalt-60 is radioactive and has a half life of 5.26 years. How long would it take a sample to decay…

A: Given- Half life=5.26 years  Initial amount=1.90mg Final amount=1.50mg

Q: What is the half-life of iron-55 if 5.93 years are required for the activity of a sample of iron-55…

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Q: The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360…

A: As per guidelines if multiple questions posted , first question is allowed to answer , please post…

Q: The half-life of Ga-67 is 77.9 hours. How long will it take Ga-67 to decay and lose 95% of its…

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Q: At a given time, there are 1.2 mg of a radioactive substance present. After 6 hours there is only…

A: To solve this question, first find out the rate constant of radioactive substance and using that…

Q: The half-life of radiogold is approximately 3 days. If 1.5 g of this has been administered to a…

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Q: 8. A radioisotope is going to be used in an experiment. At the end of 10 days, only 5% is to be…

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Q: After 19 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

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Q: . If the half-life of a radioisotope is 3

A: Half life (t1/2 or t50%) :  The time required to consume half of the initial reactant is called "…

Q: A radioactive isotope has a half life of 60.2 minutes.How long will it take for radiation from a 325…

A: The radioactive decay of an isotope follows a first-order reaction, The integrated rate law for a…

Q: The half-life of cobalt-60 is 5.3 years. How long will it take for a 1.000-mg sample of cobalt-60 to…

A: Given: The half-life of Co-60 is 5.3 years. The initial amount of Co-60 is 1.000 mg. The amount of…

Q: Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240 mol sample of…

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Q: A radioactive isotope emits 999 disintegrations per minute due to beta decay. If after 1.01 years…

A: Since the relationship between activity and time is given by  A0 e-λt = A where A = activity after t…

Q: What is the half-life of chromium-56 if 12.8 minutes are required for the activity of a sample of…

A: Radioactive decay follow first order kinectics . Half life for first order reaction  = 0.693/k  k is…

Q: Co-60 is used extensively in radiotherapy as a source of y - rays. Its half-life is 5.27 years. a)…

A: Given, t1/2 = 5.27 years (a) The time required to decrease the activity by 35% of its original value…

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: Na-24 is used in medicine to study the circulatory system. If one gram of Na-24 decomposes by beta…

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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: A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the decay…

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

A: Suppose the initial amount of sample be Ao After 119 days, amount remaining, A = (1/21) Ao The…

Q: Ca-60 is used extensively in radiotherapy, its half-life is 5.27 years. How many years will it take…

A: The given data is as follows: The half life Co-60 = 5.27 years The initial amount A∘= 100 The left…

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.