long after an animal dies will it take for the C14 to decrease by 60 percent (to 40 percent of its original value)?   less than 1 half-life   1 half-life   between 1 and 2 times the half-life   3 times the half-life

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

A: Given  Half life of Lead - 196     = 37 min  Initial Amount (A)0          =  64 mg Remaining Amount…

Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

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Q: Technetium-99m, a metastable state of technetium-99 commonly used in nuclear medicine, has a…

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Q: If a tree dies and the trunk remains undisturbed for 1.155 x 104 years, what percentage of the…

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Q: A sample of sodium-24 chloride contains 0.050 mg of Na-34. After 20.7 h, 0.019 mg of Na-34 is left.…

A: Any radioactive decay is a first order reaction. For the decay reaction, the decay constant K is…

Q: A sample of radioactive technetium-99 of half-life 6 hh is to be used in a clinical examination. The…

A: Given: Half-life of isotope = 6 hours. And the time passed = 15 hours.

Q: Sodium-24 has a half-life of 14.8 hours. How much of a 553.8 mg553.8 mg sodium-24 sample will remain…

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Q: One of the stable isotopes of Mg is Mg-24 What is the atomic number of Mg   Enter whole number only…

A: Given  isotope of Mg -24  a) Atomic number is defined as the number of protons present in the…

Q: Halfnum-172 (172Hf) has a half- life of 1.87 years. How much is left of a 100 mg sample after 5…

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Q: A certain drug has a half-life in the body of 7.0 h. What should the interval between doses be, if…

A: Given that : The half-life of the drug = 7.0 h Let the initial concentration of the drug be x

Q: The half-life time of an isotope of element X is 7.4 hours. Assuming that you start with 431 mg of…

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Q: If a tree dies and the trunk remains undisturbed for 13,589 years, what percentage of original…

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Q: The half-lives of different radioisotopes are given in the table. Half-life (min) 12 37 potassium-44…

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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 certain chemical in a tank was found to be 5ppm. However, this chemical's half-life is 3 hrs and a…

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Q: A radioactive substance decays at a rate proportional to the amount present. If 45 percent of a…

A: Given :   Time (t) = 20 years  Percentage of substance decays = 45 %

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: If you have a sample of radioactive material that weighs 2 grams, and only 1 gram is left that is…

A: Initial nuclei = 2 grams. Reduced nuclei = 1 grams. Time = 5 years. Half life time of material = ?

Q: 1.) Carbon-14 has a half-life of 5600 years. If you had a sample of 100% carbon-14, how much would…

A: Given, carbon-14 half life with 100 % carbon-14 sample.we are asked to calculate the amount of…

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Half life (t1/2) :-  The time required for the concentration of reactant to reduce to half of its…

Q: A substance has a half-life of 26 years. presently, if there are 6293 grams of the said substance,…

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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: Sodium-24 is used to treat leukemia and has a half-life of 15 hours. A patient was injected with a…

A: Radioactive disintegration  is very unstable nucleus loosing energy  and it follows first order

Q: The half-life of 9USr is 29 years. What fraction of the atoms in a sample of 0Sr would remain 175…

A: here we are required to find the fraction of sample of Sr that would remain after 175 years later

Q: A substance has a half-life of two days.  If 10 days have passed, how many half-lives has the…

A: Half life means the time in which amount of substance become half of its initial value

Q: A piece of fossilized wood has a carbon-14 radioactivity that is 1/4 that of new wood. The half-life…

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

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Q: A to 240mg sample of technetium 99M is used for a diagnostic test. if Technetium -99m has a…

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Q: Deoxyglucose labeled with fluorine-18 is commonly used in PET scans to locate tumors. Fluorine-18…

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Q: a drug has instantaneous distribution and a half life of 3 hours. there are drug still in the body…

A: Given, the half life time of the drug (t1/2) = 3 hours time is taken to metabolism the drug (t) = 12…

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: Decide whether each of the following statements makes sense (or is clearly true) or does not make…

A: Half life time of any compound means the time required for a compound to be decayed to its half of…

Q: isotope of technetium (technetium-99m), has a half-life of 6 hours. A hospital has a sample which…

A: Half life = 6 hoursInitial amount of technetium-99m = 36 mgTime = 12 hours.

Q: Tritium (3H) has a half-life of 12.3 years. If there are 200g  of tritium at the beginning,…

A: Initial mass = 200 g  Half life = 12.3 years  We need to determine the mass after 2 years and 34…

Q: he half-life of 14/6 C is 5730 years. If a mummy wrapping contains about 1/2 as much 14/6 C as…

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Q: Iodine-131 has a half-life of 8.0 minutes. How many half lives will pass in 120 minutes?

A: Half life is defined as the time required for a substance to reduce to half of it's initial…

Q: A certain drug has a half-life in the body of 5.0 h. What should the interval between doses be, if…

A: We have to predict the interval between doses.

Q: After four half-lives, the fraction of a radioactive isotope that still remains is approximately 1/4…

A: We know that, after 1 half-life, clearly HALF of the original isotope remains.

Q: You start with 600.0 milligrams of radioactive element with a half-life of 85 days. How many days…

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Q: After 42 years, what mass remains of a 100.0 g sample of a radioactive isotope with a half-life of…

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Q: The concentration of carbon-14 in living plants is about 240 Bq/kg C. If a tree dies today, what…

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Q: A certain radioactive substance has a half life of 50 hours that is half of the original quality has…

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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.