If you know that the natural element samarium (its mass number 146) contains the radioactive isotope samarium (mass number 147) with a rate of 15.1% that is dissolved by the dissolution of alpha particles. If you know that one gram of natural samarium gives 100 alpha decay every second, then the half-life of the radioactive samarium isotope in years is

Q: A first-order reaction has a rate constant of k = 0.00160 sec-1. How many seconds will elapse before…

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Q: The half life of an unknown substance is 1 week. How much of its nuclei were disintegrated after 10…

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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: 1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms…

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Q: A sample containing I-131 has an activity of 6.40 × 108 Bq. How many days later will the sample have…

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Q: A radioactive series consists of two different radioactive materials. One radioactive material with…

A: Given that: Decay constant of parent nucleus = k1  Decay constant of daughter nucleus = k2  y1(0)=a…

Q: An archeologist discovers the bones of a person believed to have been dead for 600 years. Using…

A: Half-life of radioactive element:  = 5.73 x 103 y Activity of radio active element: A(t) = 0.259 Bq…

Q: The radioactive element 2,6°Co has a half life of years. If you had a sample of 17 g, about how long…

A: Concept: Here, in this Question we will use the Formula for Half Life that is, dNdt=-λNOn…

Q: A Geiger- Mueller counter registers an initial reading of 3200 counts while measuring a radioactive…

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Q: An unknown radioactive element decays into non-radioactive substances. In 360 days the radioactivity…

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Q: Fluorine-18 (F-18) is a commonly used radionuclide for PET scans. The half-life of F-18 is 110 min.…

A: Part (a): Let A0 denote the initial activity of the FDG solution. The volume of the FDG solution is…

Q: (a) Determine the product of the reaction Li + *He → ? + n. → Help chemPad |Xu|X| Greek (b) What is…

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Q: At the beginning of an experiment, a scientist has 336 grams of radioactive goo. After 60 minutes,…

A: Given data: The initial mass of the radioactive goo is, M0 = 336 gram The final mass of the…

Q: Question 1 Calculate the binding energy for 0.064 mole of "He (4.00150 amu) in kJ. Question 2…

A: Given data: Number of moles for He4 is 0.064 having mass mHe=4.00150 amu Number of moles for Be10 is…

Q: A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage…

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Q: unknown radioactive element decays into non-radioactive substances. In 480 days the radioactivity of…

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Q: atomic mass unit = 1.661x10-24 grams Technetium-99 has a half-life of 6 hours. Suppose a lab has 80…

A: Half life of Technetium -99      T1/2 = 6 hours Initial amount (mo) = 80 mg  Let amount left after t…

Q: Carbon 14 is a pure beta emitter that decays to 14N. If the exact atomic masses of the parent and…

A: In beta decay, a neutron in an atom's nucleus turns into a proton, an electron (the beta particle)…

Q: What is the half-life in days of a radioactive sample with 4.9x10¹5 atoms and an activity of 6.5×108…

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Q: Two nuclei have mass number in the ratio 1:8 what is the ratio their nuclear radius

A: Given data, Ratio of mass numbers = 1:8

Q: One of the nuclear fission reaction that can happen in a nuclear reactor is the fission of…

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Q: Problem 9:   Answer the following questions based on the graph of a radioactive iodine isotope shown…

A: (a) The half life of the material in days  Half-life is the time in which the 50 percent of iodine…

Q: One isotope contains an equal number of protons and neutrons, another isotope of the same element…

A: Let AM1 be the atomic mass of first isotope and AM2 is the atomic mass of second element.  We know…

Q: Iodine-131 is a beta-emitter, which decay by the first-order rate law with a half-life of 8.0 days.…

A: Let t1/2 denote the half-life of the Iodine-131. It is given as 8 days. The decay constant λ can be…

Q: Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6…

A: Mass Number = Number of protons + Number of neutrons For Plutonium: Mass Number = 244 Number of…

Q: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…

A: To the nearest hour, the radioactive half-life of the substance is 52.5hours

Q: You have a 2.8 mol pure sample of an unknown material. After 4.7 h, you discover that 89% has…

A: Given problem is based on the law of radioactive decay.

Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…

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Q: Experimentally, it is found that natural potassium emits 31 beta particles per second per gram and…

A: The objective of the question is to determine the half-life period of K-40 using the given data…

Q: a) in ten days the radioactivity of cerium-141 is reduced by 19.3%. what is the half time?(-…

A: What is the half life of cerium-141?given,Radioactivity decreases by 19.3%time(t)=10 days=8.64×105 s

Q: Consider a small pot with a copper base. The base has a thickness of 2.0 mm and a diameter of 15 cm.…

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Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…

A: Concept: The time required for a quantity to reduce to half of its initial value is known as…

Q: One method for determining the age of ancient objects is by radiocarbon dating. Natural processes…

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Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…

A: Given that, Half life of the isotope, T = 140 days  We know that,  The half life is the time in…

Q: Measurements of a certain isotope tell you that the decay rate decreases from 8322 decays/minute to…

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Q: the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the decay…

A: Given:- the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the…

Q: Substance X has a half-life of 10 years, if you start with 1000 grams, how much will be left after…

A: Given data:  Half life (t1/2)= 10 years Initial quantity (N0) = 1000 grams  Time (t)  = 100 years…

Q: 20.0 hours after being ingested 74.5 % of the original radioactive atoms have decayed or been…

A: Given,The amount of particles initially = N0The particles present after 20 hours, Nt = 0.255 ×N0…

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.