A radio-active element has half-life o: 15 years. What is the fraction that wil decay in 30 years ? (A) 0.85 (B) 0.25 (C) 0.5 (D) 0.75
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: λ =
A: Deacy of an unstable atom is defined by the radioactive decay law. It states that the probability…
Q: The activity of a freshly prepared radioactive sample with a half-life of 4 days is 1000 Bq. How…
A: Given : t1/2 = 4 days No = 1000 Bq N = 250 Bq
Q: The half-life of a particular element is 330 days. What is its decay constant?
A: The relationship between Half life t1/2 and decay constant λ is t1/2=ln2λ=0.693λ where ln2 is…
Q: An archeologist discovers the bones of a person who appeared to have been dead a very long time.…
A: Half-life of radioactive element: = 5.73 x 103 y Activity of radio active element: A(t) = 0.259 Bq…
Q: If there are 20 mmol of the radioactive isotope 3H (half-life 12 years) at t = 0, how much 3H remain…
A: Initial concentration of radioactive element is Half-life time is Find:(a) Concentration of at…
Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…
A: Let original number of atoms = NoLet the number of atoms present after time "t" = N
Q: An 1 g sample of a radioactive element takes 83.92 million years to reduce into 1 µg. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: The half-life of 231Pa is 3.25×104 years. How much of an initial 10.41 μg sample remains after…
A: Let the half life time of the sample is denoted by th. The formula for the disintegration constant…
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: 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: If a 3.16-g sample of an isotope having a mass number of 135 decays at a rate of 0.530 Ci, what is…
A: Given Mass of Isotope = 3.16 gram = 3.16×10-3 Kg Mass Number = 135 Rate of decay = 0.530 Ci As…
Q: The relatively scarce naturally occurring calcium isotope48 Ca has a half-life of about 2×1016 y .…
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Q: The stable isotope of sodium is 23Na. (a) Find the total binding energy and the binding energy per…
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Q: What is the binding energy per nucleon in an atom of 42Ca ? Use the following 20 atomic masses in…
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Q: 3065Zn decays via ββ+ and EC (electron capture). Estimate the half-life of the fully ionized Zinc…
A: Zn-65 disintegrates by an electron capture to the 115keV excited level and by electron capture and…
Q: What is the nuclear binding energy per nucleon of a Cl atom? (c = 2.998 x 10° m/s 1 amu = 1.66054 x…
A: Mass defect is given as, Δm=Zmp+(A-Z)mn-mC1735l=17×1.00728+18×1.00867-34.968852=0.308995…
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: An 10 g sample of a radioactive element takes 5432.6 years to reduce into 1 g. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: Calculate the number of phosphorus P nuclei decayed during the first week, if the initial number of…
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: Consider a pure 4.0g sample of radioactive gallium-67. If the half-life is 78 h, how much time is…
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Q: 50Vhas one of the longest known radioactive half-lives. In a difficult experiment, a researcher…
A: N=Noe-λtNo is the number present at t=0 and λ is the decay constantλ=0.693t12The radioactive dating,…
Q: You have an istope with a decay constant of 2.48x10-³s-¹. What is the half life of isotope?
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Q: What is the mass of 1ci of 227Th? If the half-life is 1.90 years.
A: T1/2 = 1.90 years = 1.90 x 3.15 x 107 s λ = 0.693/T1/2 = 0.693/(1.90 x 3.15 x107s)
Q: The half-life of a particular element is 330 days. What is its decay constant?
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Q: Radioactive 214^83 Bi has a half-life of 19.9 min if the activity of the radionuclide 1.2 hours…
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Q: A specific radioactive material was measured to have an activity of 347 MBq at 7:00 A.M., what is…
A: Given: The initial activity of the radioactive material at t = 0 (7:00 A.M) is A0 = 347 MBq The…
Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 60.2 h?
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Q: A freshly prepared sample of a certain radioactive isotope has an activity of 3.7 × 1011 decays/s.…
A: Relation between activity of the radioactive isotope and half life…
Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…
A: Half life of C-14 T1/2= yearsinitial activity of sample A0= BqActivity of sample At = Bq
Q: Co decays with a half-life of 5.27 years to produce 8 Ni. 60 (a) What is the decay constant for the…
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Q: A nuclide whose "generic" symbol is 6430X would have protons and neutrons.
A: The generic symbol of a nuclide is given as X3064.
Q: In a piece of rock from the Moon, the Rb content is assayed to be 1.89×1010 atoms per gram of…
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Q: Problem 8: In a living organism, a fixed fraction 1.30 × 10-12 of 12C is the radioactive isotope…
A: Given data: fixed fraction =1.30 × 10-12 of 12C Need to determine the numeric value is expected.
Q: A 40 grams in radionuclide decays 35 grams in 240 years. What is the half-life of the radionuclide?
A:
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