The half life of Pa-234 is 6.75 hours. What fraction of a sample of this isotope remains after 27 hours?

Q: The half-life of cobalt-60 is 5.26 years. If 50 g are left after 15.78 years, how many grams were in…

A: The  formula that relates the mass remaining of the radioisotope to the original mass is given below…

Q: Skeletal remains had lost 85%of the C-14 they originally contained. Determine the approximate age…

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

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 4.60 mg to 1.90 mg…

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Q: Element X has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10…

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Q: 7) The half life of silicon is 710 years. 40 grams are present now, how much will be present in 200…

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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: Radioactive Decay The half-life of palladium-100 is 4 days. After 20 days a sample has been reduced…

A: Given Data:  Half life of Pd-100 = 4 days  Reduced mass = 0.375g The formula of half life is given…

Q: Uranium-240 has a half-life of 14.1 hours (note this is NOT a fissionable isotope).  A country with…

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Q: A piece of literature has announced that Uranium 238( 23822U) has a binding energy of approximately…

A: We can theoretically calculate the mass of a neutron. But this will be different from the…

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

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

A: Given: Half-life of carbon-14 decay = 5730 years. Activity of carbon-14 in the sample = 51 Bq. And…

Q: Since the radioactivity of 233UF6 with a mass of 0.420 g is 9.88 * 104 Bq, find the half-life for…

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Q: If you start with a 13.16 g sample of Pt197which has a half-life of 19.89 hours, what is the mass of…

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Q: The initial amount of the radioactive material V in a rock is determined to be 6.78 mg. Only 1.46 mg…

A: final answer is = 5.3200 mg

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 radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of…

A: All radioactive decays follows first order kinetics . The integrated rate equation for first order…

Q: a 45.91 mg sample of a pure radioisotope has a half-life of 52 days, what will be the mass of the…

A: Given 45.91 mg sample of a pure radioisotope has a half-life of 52 day mass of the original…

Q: An unknown radioactive substance has a half-life of 3.20 hours. If  20.8 g of the substance is…

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Q: If half-life of carbon-14 is 5730 years, estimate the age of a bone containing 75% of its original…

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Q: An old wooden bowl unearthed in an archeological dig is found to have one‑fourth of the amount of…

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Q: A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (CPM)…

A: Given: Half-life = 5730 years [A]=10 cpm [A]0 = 40 cpm

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: Suppose the amount of a certain radioactive substance in a sample decays from 6.50 mg to 2.40 mg…

A: Radioactive decay is a first-order reaction. On applying the value for rate constant k, we find it…

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: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life? a) 20…

A: The radioactive decay is an example of first order reaction.

Q: percentage of his original carbon-14

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Q: The half life for the decay of carbon-14 is 5.73 x 10³ years. Suppose the activity due to the…

A: Given: The half-life of carbon-14 = 5.73 × 103 years The activity of the sample = 81 Bq The activity…

Q: If a rock sample was found to contain 4.30 x 10-7 mol of argon-40, how much potassium-40 would also…

A: Nuclear disintegration follows first order kinetics  λ=2.303 log(A0/A)/t  λ=0.693/t1/2 or 0.693/t1/2…

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 has a half-life of 5,730 years. If a sample contains 70 mg originally, how much is left…

A: Half-life period (t1/2) is the amount of time required for a quantity to fall to half of its value…

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: 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: 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…

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

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Q: Radiocarbon dating techniques are used to determine that a very old piece of bone emits emits about…

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Q: Carbon dating can be applied to organic materials up to 5.0 x 10* years old. What percentage of the…

A: Half life is 5730 year . It is given that we want to measure 50000 year .  So time of half life to…

Q: After 4.00 years a 2.0 g sample of a radioisotope remains from a sample that had an original mass of…

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Q: 8.0mg of a radioisotope of half-life 30 minutes is used for 12 minutes. What is the amount of the…

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Q: Radiocarbon dating techniques are used to determine that a very old piece of bone emits emits about…

A: Calculate the number of half lives which have been involved in the degradation. If n is the number…

Q: A 10.00-g plant fossil from an archaeological site is found to have a 14C activity of 3094…

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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: A 371.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: On passing a half life the concentration of the substance becomes half. Let the substance has passed…

Q: The cesium-137 has a half life of 30 years after 90 years about 10g.remains. the original mass of…

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Q: The half-life of carbon-14 is about 5730 years. If an ancient leather strap is about 11,500 years…

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