A volcanic eruption melts a large area of rock, and all gasesare expelled. After cooling, ⁴⁰₁₈Ar accumulates from the ongoing decay of ⁴⁰₁₉K in the rock (t1₁/₂=1.25X10⁹yr). When a piece ofrock is analyzed, it is found to contain 1.38 mmol of ⁴⁰K and1.14 mmol of ⁴⁰Ar. How long ago did the rock cool?

Q: Uranium -238 decays in a series of steps to Pb-206. When the material is very old, one can treat the…

A: Radioactive decay follows 1st order reaction.  Given the half-life, t1/2 = 4.50*109 yr

Q: An animal skeleton has a carbon-14 decay rate of 11.1 disintegrations per minute per gram of carbon.…

A: given: carbon-14 has a half-life = 5730 yrs  carbon-14 decay rate = 11.1 disintegrations carbon-14…

Q: Carbon-14 (C-14) is a radioactive isotope with a of 5,730 years. It decays to stable through beta…

A: The main use of C-14 is for dating purposes that is determining the age of buried organic materials…

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A: We need to fill answers for the given short questions.

Q: Uranium is radioactive and decays into lead.  This process can be used to date rocks.  A piece of…

A: This problem is based on nuclear chemistry. We know radioactive decay follows first order chemical…

Q: (28) An archaeologist claims that a bone in her collection is from a saber-toothed tiger that is…

A: Given that, for a carbon-14 The initial decay rate is -dNdt0 = 15.3 disintegrations per minute per…

Q: A 61 −kg−kg person is accidentally exposed for 224 ss to a 17 −mCi−mCi source of beta radiation…

A: Interpretation: A 61-kg person is accidentally exposed for 224 s to a 17 −mCi source of beta…

Q: eological site conta

A: Given N=2,400 decays/min m=500g=0.500kg Half-life 0f  C14 ,T12  =5,730 year

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A:

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A: he a

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

A:

Q: What is the half-life of an isotope that decays to 25% of its original activity in 17.8 h?…

A: Given:- Let initial activity of an isotope=No Activity of isotope decayed in 17.8 h= x = 25% of No…

Q: 10. A student currently has 30 mg of caffeine in her body. If the caffeine came from a coffee drink…

A: Given:Currendy amount of caffeine in body, [A] = 30 mgcurrent time, t= 12 hrs half life…

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A:

Q: Radioactive iodine−131 (t1/2 = 8.0 days) decays to form xenon−131 by emission of a β particle. How…

A:

Q: 6. iodine-131 (tı/2 = 8.02 days) is one possible product of uranium-235 fission and is a major…

A:

Q: 121 6) Consider the unstable nuclide, ¹1n. a) What is the most likely mode of decay for this…

A: Note: As per the guidelines, solution of 6th question has been made. For the expert solution of 7th…

Q: What is the age of a fossil that has a carbon-14 decay rate of 6.5 disintegrations per minute per g…

A: Formula used y=a e-nt where y is the final  amount of death = 6.5dis/min           x is the initial…

Q: radioactive material initially is observed to have an activity of 8000 decays/sec. If twelve hours…

A: Radioactive decay follow first order kinetics. For first order reaction:  Kt = ln(A0/At) K = Rate…

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A: Decay rate and Half life : Materials that are unstable degrade into stable states. A radioactive…

Q: Find the activity of a sample containing 1.51 x 10-6 g of  6027(Co) (T1/2 = 5.27 years).

A:

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Q: An ancient skull has a carbon-14 decay rate of 0.85 disintegrationsper minute per gram of carbon…

A:

Q: Nickel-63

A: Given, Half life = 92.0 yr Initial moles = 1.250  Time t = ?

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Q: A researcher claims that an ancient scroll originated from Greek scholars in about 500 B.C. Its…

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Q: 2. An archaeologist uncovers a wooden object at an archaeological site. The object is found to have…

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Q: initial activity of C-14 is 14.2 disintegrations/min/g 2.97 disintegrations/min/g mammoth live? of…

A: Answer: Radioactive decay is a first order reaction, therefore integrated rate law for first order…

Q: The carbon-14 decay rate of a sample obtained from a young tree is 0.252 disintegration per second…

A: Decay process is a first order reaction. Therefore we have to put the integrated rate law for first…

Q: QUESTION 7 A radioactive isotope, Z-109, has a half-life of 62.3 years. How many years (y) will it…

A: First of all by using half life period, we can calculate the the rate constant k and then by using…

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A:

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: Potassium-40 decays to argon-40 with a half-life of1.27x109 yr. What is the age of a rock in which…

A: Half-life: It is defined as the time required for a quantity to reduce half of its initial value.…

Q: (Q114) A meteorite recovered from a meteor landing site in the Australian outback contains 0.438 g…

A: we have to calculate the age of meteorite

Q: an archaeologist graduate student found a leg bone of a large animal during the building of a new…

A: Given that, Decay rate = 15.30 disintegration Half life = 5730 years Since, disintegration follow…

Q: Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the…

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Q: The following isotopes (listed with their half-lives) have been used in the medical and biological…

A: Activity of any radioactive reactant is given by  Activity = number of particles X decay rate…

Q: How old is a rock that contains 0.065 g of uranium-238 (t₁/2 = 4.5 x 10⁹ years) and 0.023 g of…

A:

Q: The carbon-14 decay rate of a sample obtained from a young tree is 0.251 disintegrations per second…

A: The given problem involves determining the age of an object based on the decay rates of two…

Q: The nuclide 'Be undergoes spontaneous radioactive decay to 'ÇB with emission of a beta particle.…

A: During radioactive decay, an unstable nucleus is decomposed to a stable nucleus by the emission of…