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: Iodine-131 has a half life of 8.0 days determine how many days must elapse for a 0.80 mg sample of…

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Q: Carbon-14 has a half-life of 5730 yr. The decay rate of 14C in fresh wood is 13.6 counts per minute…

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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…

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Q: 29) a rock from the moon was found to contain 1.0 x 10* g (A,) of uranium-238 and 4.0 x 10“ g…

A: The half-life of a radioactive isotope (t1/2 ): All radioactive decay first-order reaction kinetics.…

Q: Fluorine-18 is an isotope used in PET scans. If a researcher has 1.5 micrograms of 18F, how long…

A: As radioactive decay is a first-order process and can be described in terms of either the…

Q: One of the radioactive isotopes used in medical treatment or analysis is iron-59. The half-life of…

A: Radioactive decay obeys first order decay kinetics   At=Aoe0.693t12×twhereAt= final activityAo=…

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…

Q: Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage…

A: Formula for radioactive decay is given as,

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: 8. How long does it take for 65.0% of each isotope to decay? Half-Life 27 s 11.5 min 14.8 h 2.1 X…

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Q: Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage…

A: Half life of technetium - 99 is = 6 hours.  Let Take a sample of technetium - 99 having number of…

Q: An isotope of cobalt-60, is used in medical therapy. When the radioisotope activity has decreased to…

A: The half-life of cobalt-60 is given as 5.24 years. This means that the radioisotope activity will…

Q: Cs-134 has a half-life of 2.0 years. How much of a 2.50-g sample of this isotope will remain after…

A: Given :- half life of Cs-134 = 2.0 years                Initial amount of sample = 2.50-g  To…

Q: The half-life of Polonium-218 is 3.00 minutes.  How many half-lives pass after 18.0 minutes ?  The…

A: Concept - Radioactive decays are first order reactions. So we use the formula, Nt = No(1/2)n, where…

Q: A patient is given 0.050 ug of technetium-99m, a radioactive isotope with a half-life of about 6.0…

A: Given: Mass of technetium-99m = 0.050μg half life= 6.0 h Mass of technetium to decay= 1.0×10-3μg

Q: How much of a 560-mg sample of a radioactive substance is left after 102 years if the half-life of…

A: Half life of any substance is defined as the time taken to reduce the initial concentration to its…

Q: 1. A lab tech prepares 50.0 mg of I-123 on Tuesday, how many mg will remain 39 hours later if the…

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Q: What is the age of a fossil that has a carbon-14 decay rate of 6.5 disintegrations per minute per g…

A: Formula used y=a e-nt where y is the final  amount of death = 6.5dis/min           x is the initial…

Q: Fluorine-18, which has a half-life of 110 minmin, is used in PET scans. 1) If 105. mgmg of…

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Q: sample

A: We will calculate t1/2 by the help of given information

Q: Th-234 has a half-life of 24.1 days. If a 355 mg sample is initially present, how many half-lives…

A: Given  Half life ( t1/2 )  = 24.1 days  Initial amount  = 355 mg  Time ( t ) = 96.4 days  Number of…

Q: If 24% of a certain radiolsotope decays in 6.5 years, what is the half life of this isotope?…

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Q: The half-life of 90Sr is 28.8 years. How long will it take (in years) for a 86.1 mg sample of 20Sr…

A: Given t= 28.8 years. t1/2 = ?

Q: 11047Ag → 0.je + 110 48Cd For the nuclear reaction Starting with 200. g of Ag-110 in a container,…

A: Since you have asked multiple question, as per our company guidelines we are supposed to answer the…

Q: The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a sample containing 728-g…

A: Known: Half-life  = 8.0 days Original mass = 728 g Time elapsed = 6.86 weeks = (6.86 ×7)…

Q: if 8.000 grams of U-234 are sealed in a container and then opened many years later -- how much time…

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Q: If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days?…

A: Mass of sample =1.25 g Time, t = 65 days Mass remained = 0.675 g

Q: Barium-131 is a radioisotope used to study bone formation. A patient ingested barium-131. How much…

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

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Q: Tc-99m is the most commonly used radioactive isotope in medicine. It is a gamma emitter and has a…

A: The half life of Tc-99 is six hours. There will be two half lives involved in twelve hours. The…

Q: An archaeologist claims that a bone in her collection is from a saber-tooth tiger that is believed…

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Q: 3. What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in…

A: Given: Initial mass of nitrogen-16 (N0) = 100g Final mass of nitrogen-16 (N) = 12.5g Time (t) = 21.6…

Q: Radium-226 (atomic mass - 226.03), the only naturally occurring isotope of this element, follows the…

A: Since the half-life of the 2nd and 3rd decay are very small in comparison to the 1st one, the 2nd…

Q: How many half-lives did a radio-active sample complete is 2.5 g of a sample remains from 20.0 g…

A: Half-life time: The time in which the concentration of the radioactive species decreases to half is…