If the half-life of a parent material is 10 Ma, and about 88% (rounded) has decayed to daughter material, how many years have passed?

Q: 1. A substance has a mass of 5 grams after decaying for 100 minutes. What was the mass of the…

A: Given that: Mass of substance left after decaying = 5 g Total time for decaying of substance = 100…

Q: The carbon-14 activity of an artifact from a burial site was 9.2 min'gl. The half-life of carbon-14…

A: The C-14 decay reactions are first order reactions. Since we know that the relationship between the…

Q: Krypton-79 has a half-life of 34.50 h. After 138.0 h, 54.25 kg of this radioistope is left. How much…

A: Given, the half-life of Krypton-79 is 34.50 hthe amount of radioisotop left after 138.0 h is 54.25…

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: 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: A rock contains 0.257 mg of Pb-206 for every milligram of U-238.The half-life for the decay of U-238…

A:

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

A: Answer is given below.

Q: a wooden object from the site of an ancient temple has a carbon-14 activity of 10 counts/min…

A:

Q: After 52 hours of decay, only 0.06m of Cu-64 remains from the original sample of 1g. What is the…

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: Carbon-14 has a half-life of 5730  years . In a plant fossil, you find that the  14C  has decayed to…

A:

Q: What is the nuclear binding energy per nucleon of the most stable isotope Iron-56 in terms of…

A: Nuclear binding energy can be defined as the minimum amount of energy required to break down an…

Q: What isotope is used for radioactive dating of previously lived entity ?

A: Isotopes are the species which have same atomic number but different mass number. These are the…

Q: 8. How long will it take for a sample of plutonium -239 with a half-life of 24000 years to decay to…

A: Given information : plutonium-239 Half life (t1/2) = 24,000 years Initial amount = Ao Final amount…

Q: Predict the mode of decay of (a) plutonium-239, (b) indium-12o?

A: Pu-239 undergoes alpha decay and forms U-235. Alpha decay leads to decrease in atomic number by 2…

Q: A small figure carved from wood, believed to predate the period of Roman occupation of the Middle…

A:

Q: a 45.91 mg sample of a pure radioisotope has a half-life of 52 days, what will be the mass of the…

A: Given 45.91 mg sample of a pure radioisotope has a half-life of 52 day mass of the original…

Q: A 450.0-mg sample of technetium-99m was used for a diagnostic test.  If technetium-99m has an…

A: Given - Initial amount=450.0mg Half life=4.8h Time=48h

Q: An ancient skull has a carbon-14 decay rate of 0.85 disintegrationsper minute per gram of carbon…

A:

Q: How many half-lives have passed in each of the following situations? (a) Initially the sample is…

A: SOLUTION: Step 1: (a). Half-life is the interval of time required for one-half of the atomic nuclei…

Q: An archeological sample was predicted to be 9,415 years old. If the C-14 measured at present in the…

A:

Q: A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (CPM)…

A: Given: Half-life = 5730 years [A]=10 cpm [A]0 = 40 cpm

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

A: The decay reactions first order reactions. Since we know that the relationship between the amount of…

Q: 1. After 119 days have elapsed, 1/12 of a radioisotope sample remains undecayed. What is the…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: Nuclides with too many neutrons to be in the band of stability are most likely to decay by what…

A: Nuclides with too many neutrons lie above in the band of stability. This nuclie which has more…

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 35.2% as…

A:

Q: 20. At the time an item was produced, 0.01 of the carbon it contained was carbon-14, a radioisotope…

A: Solution

Q: 0.132-g sample of Fe-29 (half-life is 44.5 days) is allowed to decay for 265 days. What quantity of…

A:

Q: If one-trillionth of the atoms of a radioactive isotope disin-tegrate each day, what is the decay…

A: One trillionth of radioactive isotope decay takes place in a day. I trillion = 1.0 x 1012  The…

Q: How many half-lives did a radio-active sample complete is 2.5 g of a sample remains from 20.0 g…

A: Half-life time: The time in which the concentration of the radioactive species decreases to half is…

Q: True or false? During one half-life, the mass of a radioisotope is reduced by half. Explain.

A:

Q: carbon-14 activity

A: Given data, Basic equation is Ae = Ao x 0.5 (t / t1/2)   Therefore,

Q: Cesium 137 is a commonly used isotope in the treatment of some cancers, someone you know may have…

A: The reactant given is Cesium 137 i.e 13755Cs.

Q: Which isotope is the most stable if the binding energy per nucleon is the measure of a nuclide's…

A:

Q: If a rock contained 12.0 g of 4°K when the earth was formed 4.54 billion years ago and the half-life…

A:

Q: (i) Define the term 'neutron reproduction constant' koo as applied to an infinite thermal fission…

A: •NEUTRON REPRODUCTION CONSTANT (k∞):-"It is defined as ratio of number of neutron produced from…

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

A: Given data:

Q: What fraction of the decay energy is this, noting that the decay mode is π0 → ϒ+ϒ (so that all the…

A:

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: If the half-life of a 2.0 gram sample of a radionuclide is 15 hours, then the half-life of a 1.0…

A: Given: Initial mass of sample = 2.0 g. Half-life of sample = 15 hours. And final mass of sample =…

Q: A 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took 245 days…

A: Given, A 25-g sample of a pure radioisotope decayed until approximately 1 gram remains. If it took…

Q: A wooden artifact from an ancient tomb contains 30 percent of the carbon -14 that is present in…

A:

Q: Os-182 has a half-life of 21.5 hours. How many grams of a 10.0 gram sample would have decayed after…

A:

Q: How many half lives must have passed for an isotope with a half life of 10 years to decay from 1600…

A: The radioactive decay follows the First Order kinetics.

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.