The half- life of radioactive cobalt- 60 is 5.26 years.  a) Calculate the mean life and the disintegration constant.  b) What is the activity of a 1- gm sample of Co - 60? Express this activity in curies and  in rutherfords.

Q: A radioactive substance has a half-life period of 30 days. What is the disintegration constant ?

A: We know thatλ=ln2T1/2Hereλ=disintegration constantT1/2=Half life of substance

Q: 1. If a material has a half-life of 92.5 days, how long will it take for 40% of the material to…

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Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…

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Q: Radium decomposes at a rate proportional to the amount present. In 100 years, 100 mg of radium is…

A: Given: The mass of radium is No=100 mg. The reduced radium mass is N(t)=96 mg. Let λ is the decay…

Q: (Hand by written ans.)Mantles for gas lanterns contain thorium, because it forms an oxide that can…

A:

Q: Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sample of rutherfordium…

A: Given: Half life of Rutherfordium-261 t = 1.08 min.

Q: If the mass of a radioactive sample is doubled, do (a) the activity of the sample and (b) the…

A: The expression for the activity is, As radioactivity and mass of sample is directly proportional to…

Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…

A:

Q: [08] A building is contaminated with radon (" Rn ,m=222.017 570u ), a radioactive gas with a half-…

A: Radioactivity is the process of decay of heavy nucleus by the emission of energy from unstable atoms…

Q: The equation for the radioactive decay of a nucleus is dN/dT=−??. Given decay constant is λ = 2.2 x…

A: We need to provide the equation for radioactive decay and also the half life of the given nucleus.

Q: A radioactive substance has a half-life period of 30 days. What is the disintegration constant?

A:

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

A:

Q: You can sometimes find deep red crystal vases in antique stores, called uranium glass because their…

A: Given, Mass of uranium in sample,

Q: What fraction of radioactive nucleus sample survive after two half-lives?

A: Half-life is the time taken by the radioactive element to become the half of the original amount as…

Q: Determine the half-life (in s) of a radioactive sample that has a decay rate of 3.30 ✕ 1011 Bq when…

A: Given. N = 1.7*10¹⁵  dN/dt = 3.3*10¹¹ Formula used  N(t) = N⁰*0.5t/T Where  T is half life

Q: 4-16 A 6.2-mg sample of "Sr is in secular equilibrium with its daughter 0Y. (a) How many Bq of 90Sr…

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Q: Suppose that a sample of lead-214 initially has an activity of 100 Ci. The half-life of lead-214 is…

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Q: Radium decomposes at a rate proportional to the amount present. In 100 years, 100 mg of radium…

A: Given: The time is t=100 yr. The initial amount of radium is No=100 mg. The final amount of radium…

Q: After long effort, in 1902 Marie and Pierre Curie succeeded in separating from uranium ore the first…

A: a) The mass of Ra is given by, Thus,

Q: 1. A wooden object found in an Indian burial ground and subjected to radiocarbon dating. The decay…

A: The formula used is  t = 2.303λlogRoR where, Ro is the activity of live content, R is the activity…

Q: The rate at which radioactive nuclei decay is proportional to the number of such nuclei that are…

A: Given, half life period  t1/2= 1000 year

Q: The half-life of 60CO is 5.27 years. The activity of an 60 Co sample is 2.60x10° Bq. You may want to…

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Q: The age of wine can be determined by measuring its radioactive tritium content.  i. How many…

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Q: If 250 mg of a radioactive element decays to 220 mg in 36 hours, find the half-life of the element.…

A: Original mass (M) = 250 mg New mass (m) = 220 mg Time taken (t) = 36 hours using radioactive decay…

Q: a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? = b) How long…

A: Given value---  Half life time of F-17 (t 1/2) = 66 sec. We have to find---  What is the decay…

Q: What is the activity of a sample of C that contains 6.7x1020 nuclei? The half-life of C is 5700…

A: Solution:In 5700 years 6.5 × 10202 nuclei decay will take place, thus we have:5700 yrs =…

Q: a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? λ = b) How…

A: Given value--- Half life time of F -17 (t 1/2) = 66 sec. We have to find--- What is the decay…

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N…

A: Given: Iodine-120 , I-120 has half life, T1/2 = 1.35 hours. = 4860 s Initial activity , A0 = 1 Ci

Q: A wood artifact discovered in 1990 showed a 14C-activity equivalent to 43% of that found in the…

A: Given : Half life of C-14, t1/2 = 5730 years Let initial count of C-14 be N = 100 The count of C-14…

Q: The radioactive isotope of lead ^209Pb decays according to the differential equation dN/dt=-kN.  The…

A: Remaining fraction = (100-78)/100  e^-(.693t/3.3) = .22 take ln both sides  - .693t/3.3 = ln (.22) =…

Q: Given that radioactive cobalt-60 has a radioactive constant equal to 3.8 x 10° s determine its…

A: Given information: Here, λ is the radioactive constant or decay constant.

Q: The half-life of beryllium-7 is about 53.3 days. (a) Determine the decay constant for beryllium-7.…

A: Given value--- Half life time = 53.3 days. We have to find--- (a) Determine the decay constant…

Q: You have a sample of unknown medication that is radioactive. You believe you should be able to…

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Q: The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of…

A: Formula of radioactivity is as follows: I=I0e-λt…

Q: Thorium  22890Th produces a daughter nucleus that is radioactive. The daughter, in turn, produces…

A: Thorium  22890Th produces a daughter nucleus that is radioactive. The daughter, in turn, produces…

Q: Complete the following radioactive decay formulas. (Enter the missing reactant or product. Enter…

A:

Q: The isotope, tritium {H, has a half-life of 12.3 years. Assume we have 10 kg of the substance. 18 a)…

A: a) The initial number of atoms in the sample can be found using the equation,

Q: Determine the Mass Defect for Iron 56. How much binding energy is needed to hold this nucleus…

A: Therefore the mass defect is 0.6021 u OR 560.89 MeVc-2

Q: Radium-226, 226Ra, undergoes an alpha decay. The current sample of Radium-226 has an initial…

A: Given T1/2 = 1620 years Initial rate = 5.5 × 1010 Bq Final activity = 5 × 1010 Bq

Q: The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of…

A: mass of person (m) = 70 kg Activity (A)  = 5000 Bq Half life of K40 = 1.25×109 years

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.