If a quantity decreases by a factor of 8 every 30 years, what is its half-life?

Q: The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 x 10" years. Suppose…

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Q: Substance D initially weights 56 grams. After 6 minutes, it was observed that its mass decreased by…

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Q: Tritium (3H) is used in glowing "EXIT" signs located where there is no electricity for lightbulbs.…

A: Provided half life of 3H =12.26 year Provided time(t)=65.2 years The rate constant when  half life…

Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 × 10° years. Suppose…

A: Carbon 14 →Nitrogen-14 Half life t1/2 = 5.73×103 years In a nuclear reaction Nitrogen-14 is 0.524…

Q: Use the References to access important values if needed for this question. Iron-59 is a radioisotope…

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Q: What fraction of a sample of ²P will be left after 42.9 d?

A: Given, the isotope is 32P. What fraction of 32P will be left after 42.9days?

Q: Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If…

A: Given 50mg of Iodine-123 was prepared at 8AM Monday, the remaining grams present at 10AM of next day…

Q: The half-life of the radioactive isotope uranium-234 is 2.47 × 10° years. How long will it take for…

A: We have given that  Half life of Uranium-234 = t1/2 = 2.47×105 years [N]0 = 72.4 μg  [N]t = 9.05 μg…

Q: Use the exponential decay model, A = A0ekt, to solve:The half-life of polonium-210 is 140 days. How…

A: Given half life of polonium-210 is 140 days i.e. in 140 days, the amount becomes half. Using the…

Q: 5. Carbon-11, used in medical imaging, has a half-life of 20.4 min. The carbon-11 nuclides are…

A: Answer: Relation between quantity of radioactive substance and n number of half lives is shown…

Q: The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 × 10’ years. Suppose…

A: Given : Half life of potassium-40 = 1.26 X 109 years. Moles of argon-40 = 0.543 mmol. And moles of…

Q: What is the half-life of an element that begins with 100g, and 18.8g remains after 113 minutes.

A: Half life of radioactive element-is the time needed for given number of its nuclei to decay exactly…

Q: What is the half-life, in seconds,

A: A second order reaction is the reaction where the rate of the reaction depends upon both the…

Q: If 10% of a radioactive substance decomposes in 200 years, what percentage will be present at the…

A: Given is the amount decomposed after 200 years and we have to find after 1000 and 2000 years.

Q: If 25.35 grams of radioactive waste reduces to 9.75 grams of radioactive waste after 1350 years,…

A: Given, time = 1350 years  Half life , t1/2 = ?

Q: Carbon-11, used in medical imaging, has a half-life of 20.4 min. The carbon-11 nuclides are formed,…

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Q: 15) A sample of radioactive material contains 1030 atoms. If the half-life is 6hours, then, the…

A: Radioactive decay is the decay in which an unstable nucleus is broken into a number of smaller…

Q: Consider 250g of iodine which decomposes at a rate proportional to the amount present. Around 150g…

A: Answer :-  1) Proportionality constant (k) of the decomposition reaction of iodine = 0.08665 days-1.…

Q: Cobalt – 60 used in cancer therapy, decays by beta and gamma emission. The decay constant is…

A: Consider the given information is as follows; Decay constant λ = 4.18×10-9/s Half-life t12 = ?

Q: Sodium24, which is used to locate blood clots in the human circulatory system, has a halflife of…

A: Consider the given information is as follows; Order of the reaction = 1 (as radioactive decay)…

Q: Radium decomposes at a rate proportional to the amount present. If half of the original amount…

A: It is given that that half of the original i.e. initial amount disappears after 811 years for…

Q: Heeded for this question. The half-life of the radioactive isotope thallium-210 is 1.30 minutes. How…

A: half-life = t1/2  = 1.30 min initial concentration = ao = 51.3 microgram final concentration = a =…

Q: The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 x 10 years. Suppose…

A: Given-> Half life = 1.26 × 109 year Initial amount of potassium = 1.00 mmole Final amount of Ar =…

Q: Consider 250g of iodine which decomposes at a rate proportional to the amount present. Around 150g…

A: According to question, Initial amount of iodine = 250 g

Q: If the first-order half-life of tritium (³H) is 12.26 years, what amount of time is necessary for it…

A: Given data : half-life of tritium (³H) is 12.26 years Let the initial amount be x. Also given that,…

Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 × 10° years. Suppose…

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Q: If you start with 150,000 atoms of carbon-14 that goes through 4 half-lives, how many atoms will…

A: Half life is defined as the time required by the substance to decompose to half of its initial…

Q: If a sample has a half-life of 1 hour, how much of a 10.000 g sample would remain after 2 hours?

A: Any atomic nucleus which is mainly unstable tends to lose energy through radiation and this process…

Q: The half-life of Oxygen-15 is 2 min. What fraction of a sample of O-15 will remain after 5 half…

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Q: If 32 g of such substance, the remaining amount be after 4 half-life is --- g 8. 16 O 2

A: Radioactivity Decay is a process in which an unstable nuclei looses energy by radiation. A material…

Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73x 10^3 years. Suppose…

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

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Q: The half life for the radioactive decay of carbon- 14  to nitrogen- 14  is  ×5.73103  years.…

A: Half life of radioactive element-is the time needed for given number of its nuclei to decay exactly…

Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 x 10° years. Suppose…

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Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 x 10 years. Suppose…

A: calculation of age of the rock half life of C-14 is given Amount of N-14 and C-14 is given

Q: The bromine isotope Br-75 is used for imaging in positron emission tomography. Br-75 has a half-life…

A: Half life of Br- 75 ( t1/2 )         = 57 hour  Suppose initial amount [ A ]0 = 100 %  Remaining…

Q: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

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Q: The rate of decay of radium is proportional to the amount present at any time. The half-life of…

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Q: Radium decomposes at a rate proportional to the present amount. The half life of Radium is 1600…

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Q: Doxycycline is an antibiotic with a pharmaceutical half-life of 20 h. A patient takes a single dose…

A: Solution:        Half life is the time required to reduce qualntity or concentration of substance to…

Q: The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 x 10" years. Suppose…

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Q: Nuclear Engineering: If radium has a half-life of 1600 years, how much of 100 mg will remain after…

A: The question is based on the concept of chemical kinetics. We have to determine how much of the…

Q: The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 x 10° years. Suppose…

A: Given: 1.  The half-life of radioactive decay of carbon-14 to nitrogen-14 2. C-14 forms N-14…

Q: Use the References to access important values if needed for this question. The half-life of the…

A: Introduction: Radioactive isotopes can be defined as atoms that contains an unstable combination of…

Q: 10 The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10" years.…

A: This is a first order reaction and hence the half life is, t1/2 = 0.693/k

Q: 47.  Recently, the skeleton of King Richard III was found under a parking lot in England. If tissue…

A: Radioactive decay follows the first order kinetics. The rate equation for the first order reaction…

Q: The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10" years. Suppose…

A: Given: The half-life of the radioactive decay= 4.88×1010 years Initial moles of rubidium-87= 1.000…

Q: What is the half-life

A: Half life of a reaction is the time taken to reduce half the initial concentration of the…