How many half-lives have passed in each of the following situations? How much of a 48.0 g iodine-134 remains after 150 minutes if the half-life is 50 minutes? What is the half-life of a radioactive isotope if it takes 90 sec for a 225 cps to decay to 14 cps? How long does it take for a 368 cpm sample to decay to 11.5 cpm if the h

Q: An animal skeleton has a carbon-14 decay rate of 11.1 disintegrations per minute per gram of carbon.…

A: given: carbon-14 has a half-life = 5730 yrs  carbon-14 decay rate = 11.1 disintegrations carbon-14…

Q: Bandages can be sterilized by exposure to gamma radiation from cobalt-60, which has ahalf-life of…

A: Given: The mass of the sample is 5.27 Y. The half-life of cobalt-60 is 5.27 y.

Q: Iodine-131 has a half-life of 8.0 days. How long will it take 10 µg of 131I to decrease to 1/100 of…

A:

Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: We know that,→ Radioactivity Phenomena follow first oroen kinetics.So, Rate = KA1 K → Rate…

Q: A bone has a carbon-14 decay rate of 4.85 disintegrations per minute per gram of carbon. If a living…

A: Given : Decay rate of carbon-14 in bone = 4.85 disintegration per minute per gram of carbon Decay…

Q: Fluorine-18, which has a physical half-life of 110 min, is used in PET scans. if 1.00g of…

A: The fluorine-18 sample was shipped at 5:00 PM and arrives the laboratory at 9:30 AM in the next…

Q: Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s-1?…

A: a) we have  half life of W - 178 = 21.6 days = 21.6 * 24 hours = 518.4 hours = 518.4 * 3600 seconds…

Q: a) If an object that was once living died 35,500 years ago, what is the exact percentage of the 14C…

A: a. The half life equation for decay is shown below: Where; Cfinal represents final concentration…

Q: A 1.00-gram sample cantains two radioactive isotopes A and B. The half-life of isotope A is 2 hrs.…

A:

Q: Calculate the half-life of a radioisotope if it takes 72 years for a sample to decay to 12.5% of its…

A: 100 % to 50 % one t1/2. 50 % to 25 %  second t1/2. 25% to 12.5 third t1/2. three t1/2 = 72 years.…

Q: ) Cobalt―60 is a radioactive isotope with a half-life of 5.26 years and emits beta particles.…

A: Radioactive nuclei undergo disintegration with time. They emit different kind of particles and…

Q: Answer the following questions regarding the radioactive isotope polonium-210 C.A rock obtained by…

A: C) Determination of no. of half lives: Thus 3 half lives have been elapsed.

Q: .6. A sample of (_16^35)S, a ß- emitter, has an activity of 0.100 µCi. In 20.0 days, the activity of…

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

Q: Technetium-99 (half-life = 6.01 h) is used in medical imaging. How many half-lives would go by in…

A: a) Given t1/2 = 6.01 h 100% →6.01 h 50 % →6.01 h 25 % →6.01 h12.5 % →6.01 h 6.25 % →6.01 h 3.125 %…

Q: 2.103 Phosphorus-32 has a half-life of 14.3 days. Beginning with a 2.00 pug sample of this…

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Q: Iodine (131 I)  is used in diagnostic and therapeutic techniques in the treatment of thyroid…

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Q: The half-life of Po-218 is 3.05 minutes. How many minutes does it take for a sample of Po-218 to…

A: Given: Half-life of Po-218 = 3.05 minutes. And the final amount of Po-218 isotope remaining = 2.35 %…

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: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: Answer: Since, nuclear reactions are first order reactions, therefore to solve this question we will…

Q: about how much would have been left after three half-lives? A parent isotope has a half-life of 500…

A: Note : As per guidelines we can answer only the first question   The time it takes for the…

Q: Carbon-14 has a half-life of 5730 years, how old is a dress that was found to have a specific…

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Q: lodine-131 has a half-life of 8.1 days. How much of 2 g of the isotope will remain after 56.7 days?…

A: The nuclear half-life of a radioactive isotope tells you how much time must pass in order for half…

Q: What is the half‑life of an isotope that decays to 6.25%6.25% of its original activity in 24.2…

A: The half-life  is the time it takes for the concentration of that substance to fall to half of its…

Q: Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of…

A: Given that : The half-life of carbon-11 = 20.4 min We have to calculate the % of carbon-11 will…

Q: NUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

A:

Q: Iron-59 is a radioisotope that is used to evaluate bone marrow function. What is the half-life of…

A: Given, t = 190 days t1/2 = ?

Q: Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 3000 years after an…

A:

Q: A skull believed to belong to an ancient human being has a carbon-14 decay rate of 6.50 dis/min.g of…

A: Radioactive disintegration follows first order reaction and decay rate equation can expressed as,…

Q: #5 A rock contains 0.257 mg of Pb-206 for every milligram of U-238.The half-life for the decay of…

A: Radioactive decay follows first order kinetics. The integrated rate law is as below: kt=lnAoA Here,…

Q: 24 Am is used in many home smoke alarms. It has a decay half-life of 457 years. How long does it…

A: All radioactive decay follows first order kinetics. So in order to solve for the time required we…

Q: A sample of sodium thiosulfate, Na2sO3 , contains sulfur-35. Determine the mass of 35S in the sample…

A:

Q: 1.What is the half-life of 99Tc if a 500.0 g sample decays to 62.5 g in 639,000 years 2)How much of…

A: Given,Mass 500 g,Therefore, the first half-life is 250.0g.Second half-life is 125.0g.Third half-life…

Q: 1) Phosphorus-32 has a half-life of 14.0  days . Starting with 4.00  g  of  32P , how many grams…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A freshly isolated sample of 90Y was found to have an activity of 2.5 ×105 disintegrations per…

A: Given, A freshly isolated sample of 90Y was found to have an activity of 2.5 ×105 disintegrations…

Q: The half-life for Americium-241 is ______432 years__________. ? A smoke detector requires about 0.3…

A: As per guidelines we are allowed to answer one question but first question answer is very small , so…

Q: II 24 Iours, what is the half-life of Ra-226 in years? 27 3. Arsenic - 70 has a half life of 140…

A: As per our guidelines we can only solve first question. Please resubmit the other questions as next…

Q: Cobalt-60 is radioactive and has a half life of 5.26 years. How long would it take a sample to decay…

A: Given- Half life=5.26 years  Initial amount=1.90mg Final amount=1.50mg

Q: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 482 g…

A: Nuclear decay follows 1st order reaction.  Given the half-life of C-14, t1/2 = 5730 year…

Q: The half-life of a radioactive nucleus is 1.5·10 -8 s. What is this half-life in milliseconds (ms),…

A: The half-life of the given radioactive nucleus is 1.5×10-8 s. This half-life can be converted into…

Q: Consider the I-131 nucleus that is used to treat thyroid. Mass of I-131 is 130.78302 amu. 1) what is…

A: To answer questions regarding I-131 nucleus.

Q: barium -131 is a radioisotope used to study bone formation. a patient ingested barium -133. how much…

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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: Carbon-10 is an unstable isotope with an atomic mass of 10.016853 u. It undergoes beta-plus decay…

A: The total binding energy of an atom is the sum of energy that is emitted as the atom is created by…

Q: Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s"17…

A: Answer-a Relation between half life and decay constant is: λ=0.693t1/2 value of half life given is…

Q: Calculate the half-life of an isotope if 155.2 mg disintegrates to 19.40 mg in 12.9 min.

A: Given    Initial Amount [ A ]0         = 155.2 mg    Remaining amount [ A ]t  = 19.40 mg   Time ( t…

Q: The half-life of radium-226 is 1.8x103 years. How many hours will it take for a 2.50-gram sample to…

A: Interpretation-  To determine how many hours will it take for a 2.50-gram sample to decay to the…

Q: A sample of F-18 has an initial decay rate of 1.5 × 10^5/s. How long will it take for the decay rate…

A: Radioactive decay is a first-order decay process.Given, half-life of F-18, t1/2 = 1.83 hours.Initial…

Q: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 484 g…

A: Nuclear decay follows 1st order reaction.  Given the half-life of C-14, t1/2 = 5730 year…

Q: Calculate how long will it take for a sample of a radionuclide with a half-life of 39.9 days decay…

A:

Q: Hydrogen-3 is radioactive and has a half life of 12.3 years. How long would it take a sample to…

A: Given that -  Hydrogen-3 is tritium which is a radioactive isotope with half life = 12.3 years…