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: Which reaction is a fission reaction?

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Q: λ =

A: Deacy of an unstable atom is defined by the radioactive decay law. It states that the probability…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

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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: a) Natural potassium contains 40K , which has a half-life of 1.277×109 years. What mass of 40K in a…

A: a) The number of radioactive nuclei is,

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: A tree falls in a forest. How many years must pass before the 14C activity in 1.00 g of the tree’s…

A: Given: The mass of carbon atom is m=1.00 g. The activity of the tree is A=1.00 decay/h. The…

Q: One of the many isotopes used in cancer treatment is 19879Au79198Au, with a half-life of 2.70 d.…

A: The expression for the number of radioactive nuclei,

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: 18F is an unstable isotope of fluorine (Z=9) that decays by beta plus emission (β+ decay) with a…

A: The solution can be given as follows :-

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

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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: 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: A typical person of mass 65 kg contains 0.35% potassium, by weight. Of the potassium, 0.012% is 40K,…

A: Given: The mass of person is m=65 kg. The half life of nucleus is t1/2=1.28×109 y. The activity due…

Q: The nucleus 10 4Be undergoes β- decay. The atomic mass of 10 4Be is 10.013535 u. (a) How much…

A: (a) 10Be radiates a β-particle and decays to 10B spontaneously. Let M, M0 and M1 denote the masses…

Q: A radoiactive sample has a decay constant of 0.2193/minute. a. What is it's half life? b. If at the…

A: Given, Decay constant, λ = 0.2193/minuteNumber of nuclei, No = 3.2×1015 We know that,λ =…

Q: How much energy is released in the following fission process? 23592U + n→ 14156Ba +⁹236Kr+ 3n The…

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Q: 18F is an unstable isotope of fluorine (Z=9) that decays by beta plus emission (β+ decay) with a…

A: solution is given by

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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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: A nuclei has a half-life of 2.80 days. If 122 mCi were prepared but had a delay of 8.0 days. How…

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Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.92-kg…

A: The initial activity of the sample can be obtained as R0=0.92×103 g15.0 decays/min11g=1.38×104/min

Q: The iodine isotope 131 53 for Iodine is used in hospitals for diagnosis of thyroid function. 772 μg…

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Q: A radioactive sample has a decay constant of 0.219 3/minute. (a) What is its half-life? (b) If at…

A: The relation between the half life and the decay constant is  T = 0.693λ The equation of…

Q: Cobalt-60 decays with a half-life of 5.27 years into nickel-60, which then promptly emits two gamma…

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Q: What is the binding energy per nucleon for ?? 13 27 (Aluminum – 27)? Note: A neutral ?? 13 27…

A: The binding energy of a nucleus is the energy required to completely disassemble the nucleus into…