Charcoal from an ancient campfire has a ratio of 14C to 12C that is one-fourth that of new wood. About how old is the charcoal? The half-life of 1C is 5730 years. years old

Q: The half-life of a particular element is 330 days. What is its decay constant?

A: The relationship between Half life t1/2 and decay constant λ is  t1/2=ln2λ=0.693λ where ln2 is…

Q: An archeologist discovers the bones of a person who appeared to have been dead a very long time.…

A: Half-life of radioactive element: = 5.73 x 103 y Activity of radio active element: A(t) = 0.259 Bq…

Q: 14C → 14N + e Carbon dating is used to find the age of ancient objects. With 14C beta decay: 14N has…

A:

Q: An archeologist discovers the bones of a person believed to have been dead for 600 years. Using…

A: Half-life of radioactive element:  = 5.73 x 103 y Activity of radio active element: A(t) = 0.259 Bq…

Q: A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This…

A: The age of the rock is 1.36 x 10¹⁰  years

Q: A thermometer, reading 5°C, is brought into a room whose temperature is 22°C. One minute later the…

A: Given : Thermometer reading = 5° C Room temperature = 22° C One minute later thermometer reading is…

Q: At the beginning of an experiment, a scientist has 164 grams of radioactive goo. After 135 minutes,…

A:

Q: Radon gas has a half-life of 3.83 days. If 3.06 g of radon gas is present at time t = 0, what mass…

A: Given value--- Half life time = 3.83 days . N0 = 3.06 g. We need to find--- what mass of radon…

Q: What is the age in years of a bone in which the 14C/12C ratio is measured to be 2.85×10−13?  Express…

A:

Q: Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using…

A: Approach to solving the question: The formula for the radioactive decay of strontium-87 (87Sr) from…

Q: Uranium-238 undergoes alpha decay. Into what element does Uranium 238 transmute? What is the atomic…

A: 2.Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle. An…

Q: A sample of pure oK is decaying at a rate of 6.70x10² 19 decays/s. The half-life of K is 1.28x10°…

A: Here,

Q: An isotope of iodine 1311, which has an eight-day half-life, is used in nuclear medicine. A sample…

A:

Q: The isotope 208Tl undergoes β decay with a half-life of 3.1 min.  How many minutes will it take for…

A:

Q: A freshly prepared sample of a certain radioactive isotope has an activity of 3.7 × 1011 decays/s.…

A: Relation between activity of the radioactive isotope and half life…

Q: The half-life of 231Pa is 3.25×104 years. How much of an initial 10.41 μg sample remains after…

A:

Q: After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an…

A:

Q: Recently unearthed discoveries in North and South American archaeological sites show that charcoal…

A:

Q: Suppose you have a sample of radioactive material that decays with a time constant of 60 minutes. If…

A:

Q: The smallest 14C/12C ratio that can be reliably measured is about 3.0 * 10-15, setting a limit on…

A:

Q: If you start with 7.0×1010I7.0×1010I-131 atoms, how many are left after approximately 1 month?…

A: In this problem, the initial amount of I-131 atoms and half-life are given and we have to find the…

Q: The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.0 × 1010 133Ba atoms.…

A:

Q: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 146 g…

A: Given data: The mass of carbon is m=146 g. The molar mass of 12C is M=12 g/mol. The decay rate of…

Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.8 kg sample…

A: Approach to solving the question: Detailed explanation: Examples: Key references:

Q: 5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a.…

A:

Q: Radioactive element AA can decay to either element BB or element CC.The decay depends on chance, but…

A:

Q: 5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a.…

A:

Q: Consider a small pot with a copper base. The base has a thickness of 2.0 mm and a diameter of 15 cm.…

A:

Q: Oil and coal generally contain no measurable 14C. What does this tell us about how long they have…

A: Radioactivity. The half-life 14 C can be , mt=100e-0.000121t m(t) is the mass with respect to time,…

Q: Scientists can determine the age of ancient objects by the method of radiocarbon dating. The…

A: Given data :  Carbon 14C half life τ1/2 = 5730 years  By using radioactivity decay formula and half…

Q: unlabeled container of radioactive material has an activity of 78 decays/min. Four days later the…

A:

Q: After 85 years, 80 % of a radioactive material decays. What is the half-life?

A: Given, Time,t=85yrs=85×3.154×107sPercentage of the material decay= 80% We have the expression for…

Q: The half-life of 231Pa is 3.25 × 104 years. How much of an initial 10.41 µg sample remains after…

A: Given that half life of 231Pa is 3.25* 10^4 year and initial amount of sample is 10.41microgram.…

Q: An old campfire is uncovered during an archaeological dig. Its charcoal is found to contain less…

A: The expression for the age from the radioactive decay law,

Q: a piece of a spear handle is found an in archeological dig in central america. it contains 12.5% as…

A: N = 12.5% No = 0.125 No (given) We know that half life of carbon-14 is (t1/2) = 5730 years

Q: An archeologist discovers the bones of a person believed to have been dead for 600 years. Using…

A: To find the correct option

Q: The decay of a radioactive material has a count rate is 2000 decays/min. Four hours later, the decay…

A: Given that:N0=2000 decays/minN=500 decays/minTime t=4 hours