How old is a rock if the mineral biotite from the rock has 25,000 40K atoms and 75, 000 40Ar atoms? Note: 40K decays to 40Ar with half-life = 1.3 by

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

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: Carbon 14 dating assumes that the carbon dioxide on Earth today has the same radioactive content as…

A:

Q: A sample of an isotope decayed to 84.1% of its original amount after one year. What is the half-life…

A:

Q: trontium-90 is one of the products of the fission of uranium-235. This strontium isotope is…

A: Half life = 28.1 year Initial amount = 1.50 gm Final amount = 0.100 gm

Q: Calculate the half-life of a radioisotope if it decays to 12.5% of its radioactivity in 12 years.

A:

Q: 9.) Strontium 90 is a major component of the detonation of nuclear explosives: it is I dangerous…

A: We know that no of atoms  N Present at time t  are given as N= N° e-kt where N° are the initial…

Q: Suppose the amount of a certain radioactive substance in a sample decays from 8.50 mg to 3.80 mg…

A: Given Initial concentration of radioactive substance =          8.50mg Final concentration of…

Q: How old is a rock if the mineral biotite from the rock has 75,000 40K atoms and 25,000 40Ar atoms?…

A:

Q: Thorium, a rare element in the earth's crust, has over seven radioactive isotopes. Of of these Th…

A: The rate of the reaction is referred to the change in the molar concentration in the distinct…

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 zircon sample contains 4000 atoms of the radioactive element 235U. Given that 235U has a half-…

A: Time required to decay to 125 atoms os given below

Q: What is the half life of radioistope if it decays to 12.5% of its radioactivity in 12 years?

A:

Q: On irradiation of a radioactive element with neutrons, a radiochemist discovered a new nuclide…

A:

Q: 9. A wood artifact is known to have decayed and only 55% of the original artifact remains. The age…

A: Since, you have asked multiple questions, we will solve the first question for you.  In Question-9…

Q: Suppose 67.5% of a sample of radioactive 24Na has decayed after one day. Estimate the half-life of…

A: Solution is given below in next step

Q: Carbon-14 (14C) dating assumes that the carbon dioxide on the Earth today has the same radioactive…

A: The question is based on the concept of determination of age of the given sample. we know how much…

Q: In 1954 researchers found an ancient Egyptian ship that was buried near the Pyramids approximately…

A: Given The half-life period for 14C = 5730 y = 1.8 x 1011 sec. Molar mass of 14C = 14 g/mol NA =…

Q: Uranium is radioactive and decays into lead. This process can be used to date rocks. A piece of…

A:

Q: What is the half‑life of an isotope that decays to 6.25%6.25% of its original activity in 24.2…

A: The half-life  is the time it takes for the concentration of that substance to fall to half of its…

Q: Americium-241 is used in smoke detectors. If 15% of the americium-241 in a smoke detector decays in…

A:

Q: A certain isotope has a half-life of 2.00 days. How much of a 4.00g sample of this isotope will…

A: Since the decay reactions are first order reactions Hence we can say  1) Half life = ln(2) / K 2)…

Q: The half-life for the first order radioactive decay of 14C is 5730 years. An archeological sample…

A: The breaking down of atomic nuclei releases the energy and matter from nuclei. This process is named…

Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

A: t12 = ln 2K      ⇒ K =ln2t12      , Initial radioactivity  r = KN

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: 20. lodine - 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If…

A:

Q: A freshly isolated sample of 0Y was found to have an activity of 8.9 × 105 disintegrations per…

A: Given: Initial activity of isotope = 8.9 × 105 disintegrations per minute. Final activity of isotope…

Q: After 119 days have elapse 1/21 of a radioisotope sample remains undecayed. What is the half-life of…

A: Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A…

Q: lodine - 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If a…

A:

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: 44 of 48 If the half-life of a radioisotope is 3 years, the radioactivity remaining in a sample of…

A: (a) the half life is 3 year, Now, amount of sample remaining after 6 years is, 6 years means 2 half…

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

A:

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

A: Decay of C-14 follow 1st order kinetics λ (decay constant) = 0.693/t1/2 = 0.693 / 5730 years = 1.21…

Q: a radioactive isotope. Z-109 has a half life off 43.1 years. how manny years Will it take the sample…

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: radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is…

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: If a tree dies and the trunk remains undisturbed for 1.535 × 10⁴ years, what percentage of the…

A: Degradation of the  14C  is as per the first order reaction. We are having half life that can give…

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: The isotope 32P emits radiation and has a half-life of 14.3 days. Calculate the decay constant in…

A: Solution -

Q: The technique known as potassiumargon dating is used to date volcanicrock and ash, and thus…

A:

Q: A freshly isolated sample of "Y was found to have an activity of 7.3 x 10° disintegrations per…

A: Initial activity = 7.3 × 105 dps Final activity = 1.9 × 104 dps Time = 14 day + 1 hour + 15 minutes…

Q: A radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is…

A:

Q: The half life of carbon-14 is 5730 years.it takes 870.98 years for carbon 14 to decay tp 90 mg. what…

A: The radioactive decay follows first order kinetics.

Q: The half-life of strontium -90 is 28 years. How long will it take a 40 mg sample to decay to a mass…

A: Given :-  Half life i.e. t1/2 = 28 years  Initial amount of sample = 40 mg  Final amount of sample =…

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

A:

Q: A radioactive sample has a decay constant of 1.32 x 10-3 h-1. What is its half life?

A: Radioactivity is a first order kinetics. Relation for decay constant ( λ) and t1/2 relation for…

Q: A bone has a carbon-14 decay rate of 4.98 disintegrations per minute per gram of carbon. If a living…

A: Solution : N0= 4.98 dpm N(t) = 15.3 dpm  t1/2 = 5715 years  t = ?

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.