What is the half-life of a sample that decays from 200 grams to 12.5 grams in eight hours?

Q: How long does it take for a radioactive substance to decay from 360 cps to 11.25 cps if the…

A: Half-life is the time required for the reaction to be half completed. It is denoted by t1/2 . For a…

Q: A radioactive isotope has a half life of 98.9 minutes. How long will it take for the radiation from…

A: Given , Half life = 98.9 minutes Initial concentration = 325 pCi Time ,t = ?

Q: 1. A substance has a mass of 5 grams after decaying for 100 minutes. What was the mass of the…

A: Given that: Mass of substance left after decaying = 5 g Total time for decaying of substance = 100…

Q: The half-life of strontium-90 is 28 years. H

A: Given t1/2 of a reaction is 28 years  decay constant  (λ) λ = 0.693t1/2     = 0.69328 y     =…

Q: The number of radioactive nuclides in a sample decays from 3.80 x to 1020 19 9.50 x 10 in 58.0…

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Q: Fluorine-18 is an isotope used in PET scans. If a researcher has 1.5 micrograms of 18F, how long…

A: As radioactive decay is a first-order process and can be described in terms of either the…

Q: Gold-198 has a half-life of approximately 3 days. if a 100 g sample of gold-198 decays for 9 days,…

A: The objective of this question is to determine the amount of Gold-198 that remains after a certain…

Q: a certain radioactive substance decays at a rate proportional to the amount present. If a quarter of…

A: quarter of a radioactive substance decayed after 35 hours

Q: 30% of a radioactive substance has decayed after 10years, what is its half-life?

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Q: Anwita is on a geology feild trip and finds a rock that contains 38% of the original potassium-40,…

A: Half life of potassium-40= 1.25×10^9 Initial amount of potassium -40 = 100 gm Final amount of…

Q: A patient is injected with 7.58 μCi7.58 μCi of radioactive iodine‑131 that has a half‑life of…

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Q: what is the na-me, 1/2, 01 12 = day:

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Q: After 20 years, only 3.125% of the initial amount of radioactive isotope is left. What is the…

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Q: A patient is given 0.500 ug of technetium -99m, a radioactive isotope with a half-life of 6 hours.…

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Q: 1. A 20 mg sample of a pesticide has a half-life to 25 years. How long would it take to reduce the…

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Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: What is the half-life (in years) of a 1900-mg sample of a certain radioisotope that decays to 43.5…

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Q: A sample of 11C has a half-life of 20.4 minutes. What is the Decay Constant of this sample? If the…

A: (1) For radioactive decay: Decay constant : λ=0.693t12=0.69320.4 minute-1 = 0.034 minute-1    (2)…

Q: You are studying a sample of granite that is about 2.1 billion years old. You know it contains some…

A: Here granite containing uranium -235 is formed 2.1 billion years old. We have to determine the…

Q: A patient is given 0.050 ug of technetium-99m, a radioactive isotope with a half-life of about 6.0…

A: Given: Mass of technetium-99m = 0.050μg half life= 6.0 h Mass of technetium to decay= 1.0×10-3μg

Q: You have a sample of Bismuth-212 to prepare for an upcoming medical test.  This isotope has a…

A: The radioactivity follows first-order kinetics. The half-life relates to the rate constant, k for…

Q: 17. If it takes 12 half-lives for a radioactive chemical (k = 4.85 x 10-2 day¹) to decay to a level…

A: Half-life is the time taken for half of the radioactive atoms of a specific radionuclide to decay

Q: If 7.0 grams of a sample decays to 0.44 grams in 2.0 hours, what is the half-life time of the…

A: For calculation of half life first of all we need rate constant of the reaction, which can be…

Q: 1. Co decays with a half-life of 5.27 years to produce 2Ni. (a) Calculate the fraction of a sample…

A: Given a radioactive decay of cobalt to nickle. All radioactive decay follow first order kinetics…

Q: In a sample of a radioactive isotope, 20.0 % has decayed after 30.0 days. Calculate the half-life of…

A: The nuclear reactions are a type of chemical processes which lead to the formation of some new…

Q: The half-life of the radioisotope 63 Eu 158 is 1.0 hour. How many hours will the decay of 160-g…

A: Half life of first order reaction is independent of initial concentration

Q: 2. If two thirds of Rn-222 decays in 6.1 days, what is the half-life of this isotope? a) 1.41 day…

A: Radioactive decays are first order kinetics.  All the equations for first order kinetics are…

Q: If it takes 60 days for 100 mgmg of a particular radioactive isotope to decay to 3.13 mgmg what is…

A: Approach to solving the question:Please see attached photos for detailed solutions. Thank you.…

Q: a patient is injected with 7.58 uCi of radioactive iodine-131 that has a half-life of 8.02 days.…

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Q: 4. You find a skull in a nearby Native American ancient burial site and with the help of 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: Iodine‑125 (I125I125) is used to treat, among other things, brain tumors and prostate cancer. It…

A: Answer is as follows

Q: If 28.0% of a sample of gallium-66 decays in 4.46 hours, what is the half-life of this isotope (in…

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Q: An archaeologist claims that a bone in her collection is from a saber-tooth tiger that is believed…

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Q: Consider the I-131 nucleus that is used to treat thyroid. Mass of I-131 is 130.78302 amu. 1) what is…

A: To answer questions regarding I-131 nucleus.

Q: 3. What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in…

A: Given: Initial mass of nitrogen-16 (N0) = 100g Final mass of nitrogen-16 (N) = 12.5g Time (t) = 21.6…

Q: The half-life of a radioactive material is 18.23 hours. If you measure 59.33 grams of the sample…

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Q: How many of the nuclei of a radioactive sample containing 2048 nuclei decay in 3 years, if it's half…

A: Half life of a radioactive sample is the time in which half of the sample is decayed i.e. 50% of the…

Q: A rock is analyzed in the laboratory for radiometric dating and found to contain 1/8 parent atoms…

A: Any process that occurs by radioactive decay follows first-order kinetics. The equation used to…

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.