the carbon in a human skull  in South America contained 25% c-14 relative to living orginisms. How old is the skull?

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: Isotopes X goes through a BETA decay and becomes isotape Y. isotape Y goes through an ALPHA decay…

A: The different types of radioactive decay are as follows; α-decay               ⇒             XZA  →…

Q: A sample of wood from an Egyptian mummy case has a specific activity of 9.41 d/min-g. How old is the…

A: Solution: We know that --- for a sample of wood from an Egyptian mummy which is related to…

Q: The age of a fossil with 87% of the original radioactive C-14 (k=1.2x10-4 yr-1) is   37,000 yr…

A: Given data,k=1.2×10-4yr-1Let the initial concentration be 100therefore,Final concentration=87

Q: if the passing of five half -life leaves 50.0g of a of radioisotope sample, how much was present in…

A: Mass of sample after 5 half life = 50 g Initial amount = ?

Q: Is it possible to use U-238 in chain reaction?

A: Uranium-238 is also denoted as U-238 or 238U. It is the most common uranium isotope found in nature.…

Q: eological site conta

A: Given N=2,400 decays/min m=500g=0.500kg Half-life 0f  C14 ,T12  =5,730 year

Q: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

Q: At the end of two half-lives, what fraction of the atoms had not decayed?

A: Answer is given below.

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

A:

Q: A 3.6-kg laboratory animal receives a single dose of 8.92×10-4 Gy. (a) How many rads did the animal…

A: (a) Given data contains, Mass of laboratory animal is 3.6-kg. Dose received is 8.92x10-4 Gy.

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: 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: Using a C-14 isotope, how many half-lives could have passed if a fossil is approximately 19, 080…

A: Given, Age of fossil = 19,080 yr

Q: A wooden artifact is found in an ancient tomb. Its carbon-14   activity is measured to be 61.0% of…

A: Activity of carbon-14 = 0.61 R/Ro = 0.61 We will use the below equation for decay process- R=…

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: Explain how you might use radioactive Fe-59 (a beta emitter with t 1/2= 44.5 days) to determine the…

A: Given: Half life of Fe-59 = 44.5 days let the initial amount of Fe-59 be 100 mg. Final amount of…

Q: Which of the following conditions is not necessary for a sustained chain reaction ? A) Fast moving…

A:

Q: What is the age in years of mummified primate skin that contains 6.25% of the original quantity of…

A: We have to predict the age in years.

Q: 5. A sample of wood from a Thracian chariot found in an excavation in Bulgaria has C-14 activity of…

A:

Q: A fossil is found to have a 14C level of 68.0% compared to living organisms. How old is the fossil?

A: Using first order kinetics formula we can determine age of fossil.

Q: What is the age of mummified primate skin that contains 8.25% of the original quantity of 14C?

A: The half-life of C-14 is 5730 years. The formula for half-life is given by, t1/2=0.693k where k is…

Q: 14C decays to 12C with a half-life of about 5,700 years. Suppose you find a fossil in which the…

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

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

A:

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 3.6-kg laboratory animal receives a single dose of=8.92X10⁻⁴Gy. (a) How many rads did the animal…

A: Given data,Dose=8.92×10-4Gy Conversion factors; 1 rad = 0.01 Gy 1 Gy = 1J/Kg

Q: A sample of wood from an Egyptian mummy case has a specific activity of 4.71 d/min g. How old is the…

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 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: What is the estimated age of a material whose C-14 activity is only 30% that of living wood? (C-14…

A:

Q: Carbon-14 occurs in living organisms with a fixed ratio to nonradioactive carbon-12. After a plant…

A: Radioactive decay follows first order kinetics.  We know that : k = 0.693/t0.5 ...(1)  Here, t0.5 =…

Q: Carbon extracted from an ancient skull contained only one-fifth as much 14C as carbon extracted from…

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: 17 1. on + ? + ENERGY Complete the following nuclear reaction 3H + 2,H O A. SHe <-- + u0 O D.a

A:

Q: Given that the ratio of C/1C 13.6 counts per minute per gram living matter remains constant, if a…

A: This problem is based on radioactivity. Since all the radioactive reactions generally follows first…

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

A:

Q: Co-60 is used extensively in radiotherapy as a source of y - rays. Its half-life is 5.27 years. a)…

A: Given, t1/2 = 5.27 years (a) The time required to decrease the activity by 35% of its original value…

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: what is the half life of an isotope that decays to 25% of its original activity in 68.9 hours?

A: For a first order reaction, rate constant can be calculated as

Q: Preparation of ( Carbon- 11) ?

A: We can generate 11C in nuclear reactions as follows.

Q: Predict the mode of decay begin 65^N undergoes. Positron Beta It is stable and does not undergo…

A: The beta decay of 65Ni is shown

Q: A fossilized bone is found to contain one-fifth of the C-14 level found in living matter. Estimate…

A: Given,  A fossilized bone is found to contain one-fifth of the C-14 level the age of the fossil is:

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: Which of the following processes is nonspontaneous?     Ball rolls down an incline.…

A: If we put the ball in an inclined plane, the ball rolls freely without providing energy as the…

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: The frozen remains of a young Incan womanwere discovered by archeologist Johan Reinhard on Mt.…

A: Find the amount of carbon-14 present if the estimated age is 500 years. The exponential model for…

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

A: Every atoms of Ar produce from k. Answer 2.6 days