A tree falls in a forest. How many years must pass before the 13^C activity in 1.25 g of the tree’s carbon drops to 1.32 decay per hour?
Q: An old wooden tool, containing 120.0 grams of carbon, is found in an ancient tomb. The tool emits…
A: Given, mass of carbon is m=120g emitting rate of electrons from the beta decay of C614 is…
Q: The decay constant of 235U is 9.8×10^−10 y^−1 . How many 235U atoms will remain in a 1.0 µg sample…
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Q: Your lab has been given a radioactive sample and you determine that the decay constant is 3.00 x…
A: The activity of a radioactive sample R is where is the decay constant and N is the number of…
Q: 1. Calculate the binding energy (in MeV) per nucleon for an a-particle (He nucleus), given that the…
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Q: The half-life of 131I is 8.04 days. c) Convert 0.550 ?Ci to the SI unit the becquerel. (d) Find…
A: c) one curie is 3.7 x 1010Bq converting 0.05 micro curie we get, 0.05 μCi = 0.05 x 10-6 x 3.7 x…
Q: Rounding slightly, the nucleus 3He has a binding energy of 2.5 MeV/nucleon and the nucleus 6Li has a…
A: Given: The binding energy for He is 2.5 MeV/nucleon. The binding energy is Li is 5 MeV/nucleon.
Q: Ruthenium-106 (106 Ru) is used to treat melanoma in the eye. This isotope decays by ẞ emission with…
A: Approach to solving the question: Detailed explanation:Examples: Key references:
Q: How many half-lives would it take for 6.02×10 ^23 nuclei to decay to 6.25%(0.376×10^23) of the…
A: Initial no. Of nuclei( No) =6.02×1023 Final no. Of nuclei(N)=0.376×1023 ;(6.25% of initial no. Of…
Q: 6. The bismuth-209 nucleus has a binding energy per nucleon of 7.6154 MeV. (1 MeV is 1.60 × 10-13…
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Q: A man, whose lungs are on average filled with 1 liter of inhaled air, lives in a house with a radon…
A: Given(s): Average inhaled air= 1 lit. Radon gas activity, A=1.0 x10-12 Curie/liter. Require:…
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
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Q: A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This…
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Q: 26 amu. what is its binding energy per nucleon? (6) For the nuclear reaction 14 4. 17 He H.…
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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: A certain isotope has a half-life of 6.4 h and an atomic mass of 87.29 u. What will the activity in…
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Q: The beta decay of 40K that is a natural part of the body makes all human beings slightly…
A: Given, Beta decay of 40 K 70 kg adult have potassium = 170 g…
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: purchased by a medical supply house. If the sample has a half-life of 14 d, how long will it keep…
A: Just replace the values .... An its done
Q: The isotope 208Tl undergoes β decay with a half-life of 3.1 min. How many minutes will it take for…
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Q: How much energy is released in the following fission process? 23592U + n→ 14156Ba +⁹236Kr+ 3n The…
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Q: 11 The stability of C with respect to alpha, B*, and B decay is to be determined. Do not consider…
A: Solution: As per the given data,
Q: There is more than one isotope of natural uranium. If a researcher isolates 1.00 mg of the…
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Q: A tree falls in a forest. How many years must pass before the C activity in 1.00 g of the tree's…
A: mass = 1 g number of atoms = number of moles * avogadro number = (1/14)(6.022 * 1023) = 4.3 * 1022…
Q: In a living organism, a fixed fraction 1.30 × 10-12 of 12C is the radioactive isotope 14C, which has…
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- 1) A small building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (has an atomic mass 89.907 7 u, and its half-life is 29.1 yr. It is particularly dangerous because it substitutes for calcium in bones.) Assume that the building initially contained 250 g of this substance uniformly distributed throughout the building and that the safe level is defined as less than 10.0 decays/min (to be small in comparison to background radiation). Estimate how long will the building be unsafe?In a piece of rock from the Moon, the 8/Rb content is assayed to be 1.89×1010 atoms per gram of material and the 8/Sr content is found to be 1.08x109 atoms per gram. (The relevant decay is 87Rb → 87Sr + e¯. The half-life of the decay is 4.8 x 10 yr.) 10 (a) Determine the age of the rock. yr (b) Could the material in the rock actually be much older? No, it could not be any older. Yes, it could be much older. (c) What assumption is implicit in using the radioactive-dating method? We assume that none of the 8/Sr nuclei came from the decay of 8/Rb nuclei. We assume that all of the 8'Sr nuclei came from the decay of 8'Rb nuclei. We assume that some of the 8Sr nuclei came from the decay of 87 Rb nuclei while the rest was present initially.The isotope 1321 decays by ß- emission into stable 132 Xe with a half-life of 2.3 h. (a) How long will it take for of the original 132 I atoms to decay? (b) How long it will take for a sample of 132 I to lose 95% of its activity? 1012 of 14℃ in
- 10. The radioactive isotope (82Sr) has a half-life of 25.4 days. A sample containing this isotope has an initial activity at (t = 0) of 4.50 × 108 Bq. Calculate the number of nuclei that will decay in the time interval between t₁ = 80.0 hours. for ssi nuclei ssf624 50 ssfo 30.0 hours and t2 sf60 s 60 ssf64. An ancient club is found that contains 150 g of pure carbon and has an activity of 4 decays per second. Determine its 14 C age assuming that in living trees the ratio of 5700 years and the Avogadro number is 6.02 × 10²³. (THC) years atoms is about 1.40 × 10-¹2. Note that the half life of carbon-14 is ss160 f60 sst ssf60 sf60 ssA nuclei has a half-life of 2.80 days. If 122 mCi were prepared but had a delay of 8.0 days. How much of the nuclei is lefted to use?
- A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial sample. a) What is the initial activity of this sample? Bq b) How many days does it take for this sample to decay to 3.09e+14 nuclides? days1. What is the binding energy per nucleon for ?? 1327 (Aluminum – 27)? Note: A neutral ?? 1327(Aluminum – 27) atom has a mass of 26.981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.0086655 u; and a proton has a mass of 1.007277 u. Also, 1 u = 931.494 MeV/c2.a. 8.3 MeVb. 6.7 MeVc. 5.4 MeVd. 3.4 MeVe. 2.8 MeVThe half-life of 27Mg is 9.50 min. initially there were 3.70× 1012 27Mg nuclei present. How many 27Mg nuclei are left 29.0 min later? Please give your answer to 2 significant figures. Calculate the 27Mg activities (in Ci) at t = 0 and t = 29.0 min.
- a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? λ = b) How long will it take for the activity of a sample of 17F to decrease to 80% of its initial value? t80% =A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in Bq of a 1.36-g sample be after 19.8 h?The radioactive isotope of lead ^209Pb decays according to the differential equation dN/dt=-kN. The isotope has a half-life of 3.3 Hours. If 1 gram is presented initially, how long will it take for 78% of the lead to decay?