Torgeir is on a geology field trip and finds a meteorite that contains 6 times more argon-40 than potassium-40. The half-life of potassium-40 is 1.25 x 10° years. Assume the only decay product is argon-40. How old is the rock in billions of years (10° years)?

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Given: The half life time of thorium is t1/2=1.405×1010 y. The mass of thorium in lantern is m=300…

Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…

A: Given: Mo=200 gM=23.0 gt=1 year = 365 days

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h1 (a) Calculate the…

A: Given(s): Decay constant, λ=0.0256 h-1 Require: Half-life, t12=? Fraction of sample left after,…

Q: In a piece of rock from the Moon, the 87Rb content is assayed to be 1.82 x 1010 atoms per gram of…

A:

Q: 5. Co-60 has a half life of 5.3 years. If a pellet that has been in storage for 26.5 years contains…

A: When the radioactive atoms get decay they decay at the same rate. The pattern of half-life is the…

Q: You are an archaeologist, and send some leather clothing found at a burial site to be radiocarbon…

A: The general formula for the activity as a function of time t is given by, Here, A, Ao, λ and t…

Q: Astatine-211 undergoes gamma decay. Given the changes, if any, in the nucleus produced by this type…

A: In gamma decay energy is released in the form of photons but number of protons and neutrons remain…

Q: The decay behavior of a radioactive substance obeys first order kinetics: ln(N/No) = –kt, where N is…

A: first order kinetics,lnNN0=-ktwhere N is amount of radioactive nucle at timehalf life=20 min=1200…

Q: radioactive

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Q: The half-life of radium-226 is 1600 years. Suppose we have a 55 mg sample. Find a function that…

A: Write the expression for the radioactive decay model for the function that models the mass m(t)…

Q: 09:1 g of medium is reduced by 2.1 mg in 5 years by a-decay. Calculate the half life period of…

A: Given The initial mass of radiation Ao = 1g Mass of radiation left after 5 years (A) = 2.1 mg =…

Q: A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This…

A: The age of the rock is 1.36 x 10¹⁰  years

Q: Natural uranium is 0.7200% 235U and 99.27% 238U . What were the percentages of 235U and 238U in…

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Q: (a) Write the equation for the decay of 232 Th by a single alpha particle. (b) Determine the energy…

A: To find :  equation of decay energy released  in this decay  percentage of thorium nuclei left…

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h. (a) Calculate the…

A: We have, disintegration constant, λ=0.0256 h-1 we have to find the half-life, a fraction of the…

Q: 40. Balance the following equation: 239- Th 90 239 U 239 94 2381 94 Pu 239 93

A: Given data:  N93239p → .....+ e-10 Required: Balance the equation

Q: if you started with a parent isotope with 100% of its atoms and its half-life is 10 years. What is…

A: Given. t/T = 2 N(t) = No(1/2)t/T

Q: For questions 69-70, consider the following: Uranium (45°U) decays to lead (20 Pb) with a half-life…

A: Given data The half-life is given as t1/2 = 700 million years = 700 x 106 years The number of a lead…

Q: archaeologist sometime in the future analyzes the iron used in an old building. The iron contains…

A: half life of Ni -63  t/2 = 92 years LET x half life passed (N0 /2)X =( N0 / 128 ) = (N0 /2)7  X = 7…

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…

A: Given: The half-life of tritium = 12.3 years Amount of tritium present in the old brand =1256

Q: The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730…

A: The formula of the radioactivity is given below where, T is the half life, t is the time, Ro is the…

Q: Using a nuclidic chart, write the symbols for (a) all stable isotopes with Z =60, (b) all…

A:

Q: A certain isotope has a half-life of 9.82 h. What is its decay constant in s-1?

A: Given, The half-life of an isotope, t12 = 9.82 hr

Q: The photoelectric work function of potassium is 2 eV. What potential difference would be applied…

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Q: 1. A radioactive substance has a half-life period of 60 days What is the disintegration constant?…

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Q: Choose the BEST answer to the following. A radioactive sample has a half-life of 1 hour. Starting…

A: The number of half -life passed in a time is,

Q: Use the following half-life graph to answer the question: What is the mass of the radioactive…

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Q: A radioactive sample containing approximately 6.52×10¹3 radioactive nuclides has a half-life of 5730…

A: Radioactive nuclides are those nuclides that are unstable. This happens due to the mismatch between…

Q: A sample from human remains found near Stonehenge in England shows that 71.2% of the carbon-14 still…

A:

Q: Assume that the decay rate for Carbon 14 is k=0.00012. If charcoal found in an ancient fire pit…

A:

Q: A student carries out a radioactive decay experiment. She measures the activity of a source as a…

A: Given: The activity of the substance is given as below. Rt=714e-0.41×t…

Q: 4. a) A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams…

A: According to the exponential law of radiation, we have N=Noe-λt where λ is the decay constant and No…

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: Consider a fictional radioisotope X (311.1766 amu) a. If a 0.750 g sample of X-311 releases 5.75 x…

A: Given that:Atomic mass, M=311.1766 amua) m=0.750 g=0.750×10-3 kgN=5.75×1016Mass of alpha particle,…

Q: the sample must be due to radioactive decay. With all of this in mind, if we find that a rock…

A: This problem can be solved using radioactive decay concept.

Q: What fraction of a radioactive sample remains after (a) one, (b) two, and (c) three half-lives have…

A: a)Fraction of material left after one half life is,

Q: Earth is about 4.6 billion years old. If 235U is 0.72% abundant today, what was the ratio of 235/238…

A: Given: The time period of earth formation t = 4.6 billion years. The ratio of the 235 and 238…

Q: A sample initially consists of No radioactive atoms of a single isotope. After a time, t, the number…

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Q: After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an…

A:

Q: Use the equation for radioactive decay and solve for an algebraic expression for the time, “t” in…

A: Heavier nucleus are unstable. This is because there is increase in number of protons. This increase…