Question 1 Initially, 200 million radioactive substances were present. After 12 hours the mass has decreased by 6%. If the rate of decay is proportional to the amount of substance present at time t find the amount of remaining after 48 hours. Question 2 Determine the half-life of the radioactive substance described in Problem 1.

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A: Carbon Dating of a Sample  using the data from question and solution is present in step-2

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Q: Anwita is on a geology feild trip and finds a rock that contains 38% of the original potassium-40,…

A: Half life of potassium-40= 1.25×10^9 Initial amount of potassium -40 = 100 gm Final amount of…

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Q: Assume that the rate of decay of a radioactive substance is proportional to the amount of the…

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Q: Calculate the mass of sodium-24 that will remain in a 20.0 g sample after 75 hours. Sodium has a…

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Q: Use the table on the right to answer the following questions. 11. How long is a half-life for…

A: Note : As per our guidelines , we are supposed to answer only subparts of first question (11 to 14)…

Q: About what percentage of the original radioactive sample will be left after 8 minutes? The half-life…

A: Given,  Time = t = 8 8 minutes Half-life period = t1/2 = 2 minutes Percentage of the original…

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Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

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Q: Assume that the rate of decay of a radioactive substance is proportional to the amount of the…

A: (a) Half-life (t1/2) = 0.693 / k or, k = 0.693 / t1/2 where, k = rate constant

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Q: The half-life of sodium-24 is 15.0 hours. What percentage of a sample of sodium-24 remains after…

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Q: this response. Question 17 of 20 Quèstion 17 6 poirits Seve Arower A sample of 2°1 has a half life…

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Q: Prove that t½ = t ln (2)/ln(No/Nt) determines the half-life of a 30-g sample of  Pu-239 which is…

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Q: A) A piece of charcoal that has one-half the radioactivity of a living tree died approximately 5,568…

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Q: The half-life of Po-214 is 0.001 seconds. How much of a 10 gram sample is left after 0.003 seconds?

A: Half life of Polonium, t1/2 = 0.001 second Mass of sample = 10 g

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Q: ) Initially 200 millions of radioactive substance was present. After 12 hours the mass has decreased…

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Q: QUESTION 7 A radioactive isotope, Z-109, has a half-life of 62.3 years. How many years (y) will it…

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Q: A freshly isolated sample of 0Y was found to have an activity of 8.9 × 105 disintegrations per…

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Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

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Q: A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured…

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Q: approximately 25,000 years. How many undecayed nuclei remain after 100,000 years? b) calculate the…

A: We will use first order kinetics formula

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Q: phosphorus -32 decays to form sulfur -32. The half life of phosphorus -32 is 12 days. How much…

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Q: how many atoms would be present after 20.0days?

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Q: The half-life of strontium-90 is approximately 29 years. How much of a 500 g sample of strontium-90…

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Q: A freshly isolated sample of "Y was found to have an activity of 7.3 x 10° disintegrations per…

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Q: The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The…

A: Given : Half life of phosphorus-32 = 14.3 days And the final activity of sample of phosphorus-32 =…

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.