A rock started with 4000 atoms of a parent radioactive isotope and now has 3750 daughter isotopes. If the half life of this isotope is 50,000 years, how old is the rock?

Q: 2. A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of…

A: When the quantity is reduced to one-half of the original of a radioactive sample, then the time…

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: If the half-life of 100.0 grams of a radioactive isotope is 8 years, how many grams will remain in…

A:

Q: [Refere A 1.14 g sample of a radioactive isotope decays to 0.87 g in 36.3 hr. What is the half-life…

A: Given  Initial Amount [ A ]0   = 1.15 gram  Remaining Amount [ A ]    = 0.87 gram  Time ( t ) = 36.3…

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: Moonrock collected by a US Apollo mission is estimated to be 4.30 billion years old by uranium/ lead…

A:

Q: Complete the table for the radioactive isotope. Isotope 239 Pu, Half Life (In years) 24100, Initial…

A: The amount of time required by an element to reduce to half its quantity is called its half-life.

Q: A radioactive isotope has a half life of 17.4 minutes. How long will it take for the radiation from…

A: Half life is a time taken to half the concentration of the substance present. here , the radioactive…

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: What is the half life of a radioactive sample , if 3/4 of its nuclei decay in 2 years ?

A: Given:The amount of nuclear decay in 2 years = ¾ th of initial massAssume that the initial mass =…

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

A:

Q: pile of radioactive material with a half-life of 10 years needs to sit until 0.0039 of the original…

A:

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

A: Given: half life, t12=5.27 years[A]=0.2[A]o To calculate: Years taken to decrease to 20% of its…

Q: Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 × 1010 years. What is the…

A: Radioactive decay reactions follow first order kinetics.

Q: How many of the nuclei of a radioactive sample containing 2048nuclei decay in 3 years, if its half…

A: The number of nuclei of a radioactive sample containing 2048 nuclei that decays in 3 years is to be…

Q: The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of…

A: Given, Half Life t1/2 = 800 years. A = 12.5%  Ao = 100 %  Time , t = ?

Q: A sample of iodine-126 with an original mass of 15.00 mg loses 13.125 mg of the original mass of the…

A:

Q: Can the half-life of a given isotope be manipulated or changed to suit human needs?

A: Answer

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: A 1.55 g sample of an isotope has a half-life of 3.8 days. What mass of sample is left after 5.5…

A: Given that,Initial amount of sample = 1.55gHalf life time = 3.8 daysTime = 5.5 days

Q: A rock was dated using Carbon-14 (half life = 5730 years). If the percentage of the parent atoms…

A: Given data contains, Half-life of C-14 is 5730 years. Percentage of parent atoms is 12.5%. N0 is…

Q: 1. If the amount of the parent isotope in the original sample of a rock had been 48 grams, about how…

A:

Q: The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109…

A:

Q: 10. The 14C content of an ancient piece of wood was found to be one-sixteenth of that in living…

A: The question is based on the concept of carbon dating. We have been given the fraction of carbon…

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

A: For each half life, the specimen decays half the amount of initial amount.

Q: A chemist wishing to do an experiment requiring 4" Cat (half-life = 4.5 days) needs 9.0 µg of the…

A: Given :                          Half life = 4.5 dayes  Current quantity ( N) = 9.0μg…

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: Which of the following radioactive isotopes is the most stable? The half-life of each isotope is…

A: Half life is defined as the time required to decay to half of its original amount.

Q: . A radioactive parent isotope with 600 atoms. After the decay, 450 daughter atoms were produced.…

A:

Q: A radioactive isotope has a half life of 83.3 minutes. How long will it take for the radiation from…

A:

Q: The half-life of carbon-14 is 5730 years. The wrapping of an Egyptian mummy gave off 3.8 counts per…

A: From the given data we haveHalf life of carbon-14=5730 yearsWrapping of mummy=3.8…

Q: In a 3 X 109 -year-old rock that originally contained some 238U , which has a half-life of 4.5 X 109…

A: Half-life is defined as the time in which the original numbers of nuclei are decayed to half. In the…

Q: 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9 g of "P, how…

A: The given information is: Half-life = 14.3 days Mass of 32P currently present = 30.9 g Since it is a…

Q: Iodine-131 is a radioactive isotope. After 6.00 days, 59.6% of a sample of 13I remains. What is the…

A:

Q: A chemist wishing to do an experiment requiring 4' Cat (half-life = 4.5 days) needs 5.0 µg of the…

A: Given :  Half life (t1/2) = 4.5 days  Mass of 47Ca+2 required = 5.0 ug  Time for delivery = 96 hour…

Q: 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 48.9 g of "P, how…

A:

Q: How old is this Martian Rock that is found to be containing 12.5% of a radioactive parent nucleus?…

A: On going from Martian Rock sample containing 100% of the Radioactive nucleus, to 25% of the…

Q: What percent of a parent isotope would remain after two half lives?  50% 25% 13% 66

A: Correct option is (b) 25%

Q: What is the half‑life of an isotope that decays to 3.125%3.125% of its original activity in 41.8 h?

A: All radioactive decay follows first order kinetics. The half-life t1/2 of the radioactive decay is…

Q: A radioactive isotope has a half-life of 10,000 years. How old is the rock if the ratio of…

A: Ans

Q: A radioactive isotope has a half-life of 60.2 days. What fraction of the isotope remains after 418…

A: Provided half life(t1/2) = 60.2 days Provided time(t)=418 days Let initial amount= [A•] Let final…

Q: The 175Pt isotope has a half-life of 2.53 seconds. What percentage of the original quantity of 175Pt…

A: The radio active decay follows first order kinetics. The half life t1/2 and rate constant K of a…

Q: After 119 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

A: Suppose the initial amount of sample be Ao After 119 days, amount remaining, A = (1/21) Ao The…

Q: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

A:

Q: It takes 6400 years for one gram of a radioactive element to decay away to only 1/16 of a gram. The…

A: Given time = 6400 years M/M० = 1/16

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.10 billion years old by…

A: Concept:  Radioactive decay: It is the process by which an unstable atomic nucleus loses energy by…

Q: Uranium235 decays to a form of Pb207 with a half-life of 710 million years. If an outcrop of rock…

A: Half life of the parent isotope = 7.1 × 108 years Since radioactive decay follows first order…

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.