A piece of a spear handle is found in an archaeological dig in Central America. It contains 35.2% as much 14C as a tree living today. Based only on the half-life of 14C, how old is the spear handle? (Assume that tya for 1"C is 5730 yr.)

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: A precursor of modern-day bison is Bison latifrons. A fossil found in North Dakota was dated with…

A: Given that : The half-life of 14C is 5730 years. The initial concentration of 14C is 100 %. Out of…

Q: Phosphorus-32 is a radioactive isotope with a half-life of 14.3 d (d = days). A biochemist has a…

A: A radioactive decay follows the first order kinetics where the rate of the reaction depends on the…

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 42.1% as…

A: Given: Amount of isotope in handle = 42.1 % of a living tree. And the half-life of the isotope…

Q: How many rads does a 69−kg human receive each year from the approximately 10−8 g of 14C naturally…

A: We have given Half Life = t1/2 = 5730 yearsas we know kt1/2 = ln 2k = 0.693t1/2k = 0.6935730 yr…

Q: An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if…

A: We will use first order kinetics formula

Q: Fluorine-18, which has a physical half-life of 110 min, is used in PET scans. if 1.00g of…

A: The fluorine-18 sample was shipped at 5:00 PM and arrives the laboratory at 9:30 AM in the next…

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: Answer  4460 years

A: Expression for half-life period of radioactive element is given as,

Q: Samples recovered from an archaeological site are determined to have a 14C activity of 1.3 dpm/g.…

A: Given:   The activity of C-14 from recovered sample is 1.3 dpm/g. The activity of C-14 in living…

Q: -33. The number of radioactive nuclides in a sample decays from 1.00 × 1020 to 2.50 × 10º in 10.0…

A:

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

A: The rate constant  for half life of 60 days is calculated as,

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: A tiny piece of paper taken from the Dead Sea Scrolls has an activity of 10.8 disintegrations per…

A: Radioactive disintegration follows first order kinectics. Hence, the rate of decay can be followed…

Q: If 29.5% of the original amount of 14C is present in a wooden tool at the time of analysis, what is…

A: Since the carbon decay is a first order kinetics reaction Hence for the first order reaction we can…

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

A: The radioactive decay always follows the first order kinetics. The radioactive decay of I-125 must…

Q: If a mineral contains 1.56 % of its parent isotope, how many half-lives have gone?

A: Half Life Real analysis by the simple Concentration Analysis is mentioned in step-2  1st order…

Q: The half life of an isotope is 43 seconds. How long does it take 100.0g of that isotope to decay to…

A: Half life = 43 second k = 0.693half life= 0.69343 sec=0.016 s-1

Q: phosphorus-32 is a radioactive isotope with half-life of 14days. a biochemist has a vial containing…

A: The radioactive isotopes follows the first order reactions, which is dependent upon the…

Q: Iron-59 is a radioisotope that is used to evaluate bone marrow function. The half-life of iron-59 is…

A: Half-life of Fe-59 = 44.5 days To calculate - Time required for the Fe-59 sample to fall to 9.36 %…

Q: A sample of coral has a carbon-14 content of 12.5% the value of living coral.  If the half-life of…

A: Given  Half life of Carbon - 14 = 5730 years Remaining amount   = 12.5 %  Time ( t ) = ?

Q: The half life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A:

Q: 5.78 Cesium-137, used in cancer treatment, has a half-life of 30 yr. (5.2, 5.4) a. Write the…

A:

Q: 24 Am is used in many home smoke alarms. It has a decay half-life of 457 years. How long does it…

A: All radioactive decay follows first order kinetics. So in order to solve for the time required we…

Q: What is C-14 activity in a sample that is 2.0 x 104 yr old? Assume that C-14 activity in the living…

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: carbon as a piece of modern charcoal. How long ago was the tree burned to make the ancient charcoal?…

A:

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 41.7% as…

A: Given, half life of C14 = 5730 yr

Q: 22. A normal adult jawbone contains 200 mg of Carbon-14 in a living person. If scientists found a…

A: Given initial Concentration of C-14         = 200 mg Remaining Concentration of C-14 = 50  mg  Half…

Q: A 85.0-mg supply of iodine-131, used in hospitals in the treatment of hyperthyroidism, was stored…

A:

Q: A sample of a wooden artifact gives 5.0 disintegrations/min/g carbon. The half-life of C-14 is 5730…

A: Half life is defined as the time taken by a radioactive sample to decay to half of its original…

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

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

A:

Q: If a tree dies and the trunk remains undisturbed for 1.775 × 10⁴ years, what percentage of the…

A: Given-> Half life = 5730 year  Time = 1.775 × 104 year.

Q: 3) The half-life of 238U, which decomposes to 206PB, is 4.51 × 109 y. A rock contains equal masses…

A: Given, half-life of 238U = 4.51 x 109 y. We know that, half-life of a radioactive decay is the time…

Q: Cobalt-60 is commonly used as a source of beta-particles. How long does it take for 87.5% of a…

A: Radioactive decay is associated with the emission of small energetic particles e.g. beta particles,…

Q: If a tree dies and the trunk remains undisturbed for 1.170 × 10' years, what percentage of the…

A: This is a first order reaction. t½ = 0.693 ÷ k 5730 = 0.693 ÷ k k = 1.21 × 10-4  year-1 where k is…

Q: One of the nuclides in spent nuclear fuel is UU-235, an alpha emitter with a half-life of 703…

A: The half-life of U-235 is = 703 million years The time to reach the amount of U-235 to 1/4 of its…

Q: The half-life of Cr-51 is 28 days. If a sample had 510. g, how much Cr was there 168 days ago?

A: Radio active decay is an example for first order kinetics  In first order reaction half-life…

Q: If a tree dies and the trunk remains undisturbed for 1.015 x 104 years, what percentage of the…

A:

Q: If a tree dies and the trunk remains undisturbed for 1.635 × 10⁴ years, what percentage of the…

A: Given, time t = 1.6 x 104 years , half life t1/2 = 5730 years

Q: Carbon-14 has a half-life of 5730 yearsyears. In a plant fossil, you find that the 14C14C has…

A: Given data:

Q: In 2002, a wooden beam from the Wupatki Indian ruin in Arizona was found to contain 227 mg of…

A: Since the carbon decay reactions are first order reactions And since we know that the relationship…

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

A:

Q: 4. The remnants of an ancient fire in a cave in Africa showed a 'C decay rate of 3.9 counts per…

A: The half-life of a reaction is the time taken for the reactant to reduce to half its initial value…

Q: Carbon-14 Half-Life 120 100 80 60 40 20 5000 10000 15000 20000 25000 80000 Time in Years If a…

A: The fossilized bone is found 1/8 ratio of carbon-14 to carbon-12. The approximate age of the bone…

Q: A patient is given 0.050 mg of Tc-99. How long until the isotope decays to 6.3 x 103 mg? (Half life…

A: Given  Mass of Tc-99  [ A0 ] = 0.050 mg  Remaining Tc -99 [ At ] = 6.3 × 10-3 mg  Half life ( t1/2 )…

Q: Ca-60 is used extensively in radiotherapy, its half-life is 5.27 years. How many years will it take…

A: The given data is as follows: The half life Co-60 = 5.27 years The initial amount A∘= 100 The left…