A certain radioactive substance has a half-life of 50 hours, that is, half of the original quantity has decomposed at the end of 50 hours. How long will it take for 95% of the substance to dissipate? Please answer completely

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

A:

Q: A normal adult jawbone contains 200mg of Carbon-14 in a living person. If scientists found a jawbone…

A: Calculate the value of rate constant (k):

Q: Iodine-131 has a half life of 8 days. Your friend with a thyroid condition is given 40 mg of I-131…

A: Radioactive decay follows the first-order kinetics. The half-life of the first-order reaction does…

Q: While exploring a coal mine, scientists found plant fossils which had been preserved by an…

A:

Q: Use your knowledge obtained while studying nuclear reactions to explain how the rate of decay of a…

A: The half-life of the given radioactive reaction is the time at which the reactant is disintegrated…

Q: A 116.8 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: Given- Initial amount=116.8ng Final amount=14.60ng Time=47days

Q: A sample of 113mIn has a half-life of 100. minutes. What amount of 113mIn remains (in CPM) if a…

A: Like chemical reactions, nuclear reactions are type of chemical reaction only but here in place of…

Q: Half-life is the time required for a radioactive element to decay to half of its original mass.…

A: Given: The % of original radium sample=100% The % of a sample of radium that has decayed=75% The…

Q: What is the original mass of C-14 in a sample if 10.00 mg of it remains after 20,000 years? The…

A: The C-14 decays according to first order kinetics. Since we know that the relationship between the…

Q: Substance X has a half-life of 20 days. If a sample is originally 12 g, how much will be left after…

A: Half-life means that after that many days, only half of the sample is left. So if we start with 12…

Q: 52. Estimating the Date That a Prehistoric Man Died The bones of a prehistoric man found in the…

A: Radioactive disintegration follows the first-order kinetics, i.e., the rate of the reaction depends…

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

A: The half-life of a radioactive nucleus is 1.5 x 10-8 s.

Q: A shell fossil that originally contained 100 mg of carbon-14 non contains 75 mg of the isotope.…

A: Initial amount, [A]0 = 100 mg  Final amount, [A] = 75 mg  Half-life, t1/2 = 5570 years

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: 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: If the half-life for I-131 is 8 days and a patient is given 1.35 mg of this nucleus at 5:00 am in…

A:

Q: Suppose that 10 units of beryllium are present in a living organism and that the half-life of…

A: Here i have calculated the age of material

Q: 3. An archeologist unearths a bone sample and wants to know the age of the initial amount of…

A: Given:  Present amount of bone = 49 %  Half life = 5730 years

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

A:

Q: 8. Strontium-90 has a half-life of 28.1 years. Starting with 2.08 mg of this isotope, what is the…

A: Radioactive decay follows first order kinetics. Using this we will calculate all parts of questions.

Q: A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater…

A: The radioactive decay follows first-order kinetics. We know that the half-life of carbon-14 is 5730…

Q: An archeological sample was predicted to be 9,415 years old. If the C-14 measured at present in the…

A:

Q: Calculate the half-life of a radioisotope if it takes 144 years for a sample to decay to 12.5% of…

A: N = 0.125 No N/No = 0.125

Q: Tc-99m is commonly used in nuclear medicine.  It has a half-life of 6 hours.  The radioactivity dose…

A:

Q: A normal adult jawbone contains 200 mg of Carbon-14 in a living person. If scientists found a…

A:

Q: A normal adult jawbone contains 200 mg of Carbon-14 in a living person. If scientists found a…

A: Radioactivity is the phenomenon in which an unstable nucleus loses energy.

Q: A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater…

A: The radioactive decay follows first-order kinetics. We know that the half-life of carbon-14 is 5730…

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: Cobalt-60 is used extensively in medicine as a source of g-rays. Its half-life is 3.97 years. How…

A: Given: Half-life of Co-60 = 3.97 years = 3.97 × 365 = 1449.05 days…

Q: A normal adult jawbone contains 200 mg of Carbon-14 in a living person.  If scientists found a…

A:

Q: Archaeologists used pieces of burned wood, or charcoal, found at the site to date prehistoric…

A: Given, half life of C-14 = 5730 years. Exponential decay equation : A(t) = Ao ekt Since half life is…

Q: A vial of radioactive material is found at a site where it was left unattended. At the time the vial…

A: Given : Initial mass of reactant = 10 g And mass of reactant after 4 days = 8 g

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

A:

Q: The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found,…

A:

Q: sample of Uranium ore is estimated to have originally contained 805 mg of uranium-238. Analysis…

A:

Q: Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to…

A:

Q: Carbon-11 is a radioactive isotope of carbon. Its half-life is 20.3 minutes. What fraction of the…

A: When the rate of the reaction is directly proportional to the first power of the concentration of…

Q: Carbon-14 dating is used to find the age of ancient objects. The half-life of Carbon-14 is 5730…

A: Given : Half life of Carbon-14 = 5730 years  And the piece of clay pot has undergone 1.5 half lives.…

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

A:

Q: unknown sample contains radioactive element U-235. If the original amount present is 3500 atoms, how…

A: Given- Number of initial atom =3500 atoms Number of final atom =125 atoms  Half life =700 million…

Q: he​ half-life of the radioactive element unobtanium-37 is 5 seconds. If 32 grams of unobtanium-37…

A:

Q: Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy…

A: The expression that relates the initial number of radioactive nuclei remaining after decay after a…

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: long after an animal dies will it take for the C14 to decrease by 60 percent (to 40 percent of its…

A: Answer  Calculate the half life

Q: Different radioisotopes (Links to an external site.) have different half-lives (Links to an external…

A: 1. Half-life of a radioactive element is the time taken by it to decease it's concentration by a…

Q: What is the half life of sodium-24 if after 12 days the sample has a mass of 1.2 g from an initial…

A: Given, Initially mass of the sample (N0) = 9.6 g Mass of the sample after 12 days (N) = 1.2 g Time…

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

A: Given  Half life ( t1/2 ) = 6 hours

Q: A specimen of charcoal found contains 57% as much 14C as a sample of present day charcoal. What is…

A: Radioactive decay follows the first-order kinetics. The decay constant (λ) and half-life of a…

Q: If the half-life of compound FUSHA is 131 years, assuming that a 500g sample of meteorite containing…

A:

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.