A rock contains 120 umol of 238U (t1/2 = 2.5x10° yr) and 170 umol of 206Pb. Assuming that all the 206pb comes from decay of the 238U, estimate the rock's age.

Q: 12455 Cs has a half-life of 30.8 seconds.a) If we have 9.7 µg of Cs initially, how many Cs nuclei…

A: The objective of the question is to calculate the initial number of Cesium nuclei, the number of…

Q: The radionuclide 64Cu has a half-life of 12.7 h. If a sample contains 5.5 g of initially pure 64Cu…

A: Half-life of 64Cu, T12=12.7 h The initial mass, m0=5.50 g The decay time interval, t1=14 ht2=16 h…

Q: All the very heavy atoms found in the earth were created long ago by nuclear fusion reactions in a…

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Q: A rock recovered from far underground is found to contain 0.88 mg of 238 U, 0.15 mg of 206Pb, and…

A: Given that, A rock found underground contains: amount of U238=0.88 mgamount of P206b=0.15 mgamount…

Q: Current Attempt in Progress Find the energy (in MeV) released when a decay converts 88X226 (atomic…

A: Given,The mass of X is .The mass of Y is .The mass of alpha particle is .

Q: From the known atomic masses (nndc website), compute the Q-value of the decay 230Th → 226Ra + ?…

A: T90230h → R88226a + α The mass of the parent nuclei Thorium is mTh = 230.0331338 u The mass of…

Q: The β-particles emitted in the decay of 3H (tritium) interact with matter to create light in a…

A: Given- Activity (A) = 15.0 Ci = 15.0 Ci×1 Bq2.73×10-11Ci=5.49×1011Bq Half life of Tritium (t1/2)=…

Q: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 392 g…

A: GivenThe mass of 12C carbon in the Jewelery is 392 gThe current decay rate of 14C is 26 decay/sThe…

Q: Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.76 and 3.1. What are the…

A: The abundance ratio is given by R'=NN206PbNU238  (1) The number of nuclei for U238  and Pb206 are,…

Q: You are assisting in an anthropology lab over the summer by carrying out 14C dating. A graduate…

A: Let A denote the activity of the sample, t denote the time taken n decay. The time taken for n…

Q: Example 9: Tritium (³H) has a half-life of 12.3 years and releases 0.018 6 MeV energy per decay.…

A: Given Tritium H3 half-life t12 = 12.3 years Energy ε                          = 0.0186 MeV Mass of…

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: Formula to calculate the age of the rock is,

Q: A sample of radium Ra (atomic mass-224.020 186 u. T1/2-3.66 days) contains No - 1.07 x 1021 nuclei…

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Q: What is the energy of the antineutrino, if a phosphorus-32 atom ( 31.97390u) beta-decays into a…

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Q: Consider the nuclei  11750Sn. Determine its mass defect in kilograms if its atomic mass is 116.964…

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Q: Consider the α decay 92U143→ 90Th141+2He2.     Part (a) What energy, in megaelectron volts, is…

A: Consider the α decay 92U143→ 90Th141+2He2.

Q: Plutonium-238 (238Pu) is a radioactive isotope with a half-life of 87.7 years. If a sample of 238Pu…

A: Given Half life=87.7year Activity after the=438.5year

Q: What proportion of 235 U was present in a rock formed 3,000 x 106 years ago, given that the present…

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Q: Taking into account the recoil (kinetic energy) of the daughter nucleus, calculate the kinetic…

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Q: 238.050784 u, 234.043593 u and 4.002602 u respectively.

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Q: Plutonium-239 is used as the energy source for heart pacemakers and space probes. It decays to…

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Q: Taking into account the recoil (kinetic energy) of the daughter nucleus, calculate the kinetic…

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Q: The New Horizons spacecraft, launched in 2006, spent 9.5 years on its journey to Pluto. It derives…

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Q: A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much…

A: Given : t = 234 million years = 234 × 106 years m = 4.84 mg t1/2 = 4.47 × 109 y

Q: The half life of 60CO is 5.7 years. Find the activity of 3.54 milligram of 60Co. Give your answer in…

A: Answer is (1.37 x 1011  )decay /second (Bq). Explanation is in next step.

Q: One method used to determine unknown atomic masses consists of precisely measuring the kinetic…

A: Write the reaction. 14Si30+8O18  →14Si34+8O14 +Q Let mass of 14Si34 be m 1 amu.c2=931.5 MeV

Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.19 kg…

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Q: The ceramic glaze on a red-orange Fiestaware plate is U2O3 and contains 50.5 grams of 238U, but very…

A: Given U2O3 plate contains 50.5 g of 238U So the mass of 238U is m=50.5g   Since for 238U atomic mass…

Q: An atom of uranium-235 (atomic 235.04392 u) de- 39.8 mass: m(23U) cays to thorium-231 (atomic mass:…

A: Hi there! Since there are multiple subparts in the question posted and it is not mentioned what is…

Q: Consider the nuclei 117Sn50. Determine its mass defect in kilograms if its atomic mass is 116.968…

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Q: The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the…

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Q: What is the energy released in the fission reaction…

A: The expression for the fission reaction is,

Q: A rare decay mode has been observed in which 222 Ra emits a 14C nucleus. (a) The decay equation is…

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