5. A sample of wood from a Thracian chariot found in an excavation in Bulgaria has C-14 activity of 11.6 disintegration/minute/gram. Estimate the age of the chariot and the year it was made. (t1/2for C-14 is 5730 years, and the activity of of C-14 in living materials is 15.3 disintegration/minute/gram)

Q: 3) A wooden spear shows "C activity of 92 disintegrations/hr. A living tree has a "C activity of 150…

A:

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: If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is the…

A: Radio active decay follows first order kinetics.

Q: (28) An archaeologist claims that a bone in her collection is from a saber-toothed tiger that is…

A: Given that, for a carbon-14 The initial decay rate is -dNdt0 = 15.3 disintegrations per minute per…

Q: The half life ofC when it decays by positron emission is 20.334 minutes. How many positrons, to one…

A: Given: initial mass of 11C = 2.355 g Half life of 11C = 20.334 min. And isotopic mass of 11C =…

Q: What is the specific activity (in Ci/g) if 2.6 g of an isotope emits 4.13X10⁶ β⁻ particles per hour?

A: Curie(Ci) -is number of disintegration per second in 1g of radium-226 1Ci=3.70*1010dps

Q: The carbon-14 activity of some ancient Peruvian corn was found to be 10 disintegrations per minute…

A:

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: A moisture density gauge uses à radioactive source containing the isotope Cs-137, which has a…

A: Cs-137 has a half-life of 30.17 years . Activity of the radioactive source is 8.00 mCi, when…

Q: A laboratory rat is exposed to an alpha-radiation source whose activity is 14.3 mCi. (a) What is the…

A: Radioactivity is a spontaneous process where radioactive element emits radiations in the form of…

Q: 7. The age of an ancient tree trunk is estimated using radiocarbon dating. If the tree gives 3.75…

A:

Q: Phosporous-32 half-life is 14.3 days. A vial containing 10ug of P-32 is accidentally spilled into a…

A:

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: The smallest C-14 activity that can be measured is about 0.20%. If C-14 is used to date an object,…

A: Given :          C-14 activity measured is = 0.20% We have to calculate object died within how many…

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

A:

Q: Nickel-63

A: Given, Half life = 92.0 yr Initial moles = 1.250  Time t = ?

Q: mammoth skeleton has a carbon-14 decay rate of 0.0077 disintegration per second per gram of carbon.…

A: We need to find out how long ago the mammoth lived.  We are given the carbon-14 decay rate i.e.…

Q: World War II aircraft had instruments with glowing radium-painted dials. The activity of one such…

A: Given , Activity =2.0×105 Bq

Q: How many nuclei of Uranium-238 remain in a rock if the activity registers 464. decays per second?

A:

Q: Plutonium-239 is the fissionable isotope produced in breeder reactors; it is also produced in…

A:

Q: After 3 half-lives, the activity of a radioisotope drops to _____ of the original. Group of answer…

A: We have to predict the activity with respect to original activity.

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

A: The radioactive disintegrations tend to follow first order kinetics: Rate constant can be evaluated…

Q: How many nanograms 192-Ir are present in an iridium seed with an activity of 0.500 mCi? The atomic…

A: Given seed contains , Ir-192. Activity of Ir-192 = 0.500 m Ci

Q: How many nuclei of Uranium-238 remain in a rock if the activity registers 558. decays per second?

A:

Q: In 1947 samples of the Dead Sea Scrolls were analyzed by carbon dating. It was found that the…

A:

Q: A piece of parchment believed to be the original Magna Carta (signed at Runnymede in 1215 A.D.) is…

A: Here we have to determine the activity in dpm of a dead piece of parchment which is live 80 years…

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: 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: A laboratory rat is exposed to an alpha-radiation sourcewhose activity is 14.3 mCi. (a) What is the…

A:

Q: What is the half-life of an isotope that decays to 3.125% of its original activity in 63.6 h?…

A: We know that,  N(t) = N0(1/2)t/t1/2 No = initial amount  N(t) = amount of substance at time t t1/2 =…

Q: A Geiger counter is set to click once for every 100 disinte- grations that it detects. The counter…

A: Given conversion factor is: 1 click = 100 disintegration(d)

Q: Cobalt-60, which undergoes beta decay, has a half-life of5.26 yr. (a) How many beta particles are…

A: Half life: It is the amount of time taken by a radioactive material to decay to half of its original…

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

A:

Q: A tiny piece of paper (produced from formerly living plant matter) taken from the Dead Sea Scrolls…

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

Q: A radioactive source containing Y-90 has an initial activity of 20 µC a) How many decays per second…

A: The radioactive source containing Y-90 has an initial activity 20 μCi which equals…

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

A:

Q: In addition to the natural radioactive decay series that beginswith U-238 and ends with Pb-206,…

A: The natural radioactive decay series that begins with U-235 and ends with Pb is given below. Thus…

Q: What is the age of the artifact?

A:

Q: Krypton-87 has  a rate constant of 1.5 * 10-4 s-1. What is the activity of a 2.00 mg sample?

A: The activity of a sample of radioactive matter is defined by the number of disintegrations taking…

Q: The cloth shroud from around a mummy is found to have a 14C activity of 8.3 disintegrations per…

A: Given, The initial decay rate of carbon of cloth = 8.3 dis/min. The decay rate of carbon for living…

Q: 14.20 60Co is used extensively in medicine as a source of y-rays. Its half-life is 5.27 years. (a)…

A:

Q: A sample of wooden artifact is found to undergo 8 HC disintegrations per minute per gram of carbon.…

A:

Q: A sample of wood from an Egyptian mummy case gives a count of 8.4 cpm/gC (counts per minute per gram…

A: