b. The half life of radio-active isotopes is 140 days. How many days would it take for the activity of the sample of this isotope to fall to one-forth of its initial decay rate?

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Q: 1 The isotope 235U decays by alpha emission with a half-life of 7.0 x 10° y. It also decays (rarely)…

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Q: 1.  Suppose that you are given a 200-gram sample of a radioactive substance with a half-life of 45…

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Q: A radioactive decay series that begins with 232 90Th ends with formation of the stable nuclide 208…

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Q: Can you help solve this?

A: Since there are multiple questions posted, we will answer the first question. Half-life is defined…

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Q: The half-life of radium-226 is 1590 years. Suppose we start with a sample of radium-226 whose mass…

A: Given: The half-life of radium = 1590 years Mass of the sample = 50 mg

Q: 1) how many grams of material remain when you start with 16g and the half-life number is 3 ?

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A: Given that:- Initially amount of both U-238 and U-235 are same

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Q: 10) How much material is remaining when you start with 14-g and there has been 3.25 half-lives?

A: Let N be defined as the amount remaining. Therefore, N=12nN0 Here, N0 is the initial amount of the…

Q: 10) How much material is remaining when you start with 127-g and there has been 7.25 half-lives?

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Q: 10. a. The half-life for remembering for this class after mastering knowledge is 12 hours. Yesterday…

A: Write the given data. t1/2=12 hrsN0=18

Q: image11

A: The relation of the half-life in terms of wavelength is λ=0.693t1/2 Let's write the decay rate…

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Q: 4. A radio-active element decays as time passes. The amount of the element present in a sample is…

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Q: (i) Define the term ‘mass defect’ of a nucleus. How is it related with its binding energy?

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Q: 23. The half-life of Promethium is 17.4 years. Initially, there are 500g. Hint: A = Cekt a. How much…

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Q: A radioactive substance with an initial mass of 250 mg has a half-life of 1 year. a) Write an…

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Q: A sample of carbon-14 initially consists of 5 × 10 24 particles. Carbon-14 has a half- life of 5730…

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Q: 1. What is meant by half-life? 2. If you have 100 grams of a radioactive isotope with a half-life of…

A: Half‐life:-      The half-life of a radio active nuclide is defined   as the time T1/2 in which…

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Q: 2. The half-life of Ni-63 is 100 yrs. If you had 100g of Ni-63, how much would be left over 500 yrs?

A: Half life of Ni-63 =100 year Mass of Ni-63 = 100g Total year = 500 year

Q: 5. The isotope 1321 decays by B- emission into stable 132Xe with a half-life of 2.3 h. (a) How long…

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Q: Q2: - Two samples of the same radioactive nuclide are prepared, each having the same size. Sample A…

A: Two samples of same radioactive nuclide are prepared, each having the same size.Sample A has twice…

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

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Q: Consider two 3^He and 4^He isotopes of helium (Z=2). (a) Calculate the binding energy for both…

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