How many radioactive disintegrations occur per minute ina 0.0010-g sample of 209Po that has been freshly separatedfrom its decay products? The half-life of 209Po is 103 years.

Q: Substance D initially weights 56 grams. After 6 minutes, it was observed that its mass decreased by…

A:

Q: trontium-90 is one of the products of the fission of uranium-235. This strontium isotope is…

A: Half life = 28.1 year Initial amount = 1.50 gm Final amount = 0.100 gm

Q: The 14C in a bone has a disintegration rate of 4000 dis h1. The half life of 14C is 5730 years.…

A: The rate of disintegration is proportional to the number of atoms left after a time (N) as- Where…

Q: Assume a substance decomposes at a rate proportional to the amount present. If the decay constant of…

A: The value of decay constant is 0.0555 /yr , thus unit is yr-1  . Thie suggests that this…

Q: A sample of 400g of radioactive​ lead-210 decays to​ polonium-210 according to the function…

A: Given data : A sample of 400g of radioactive​ lead-210 decays to​ polonium-210. According to the…

Q: 31. A Yadio chemist prepames a cobalt sample 0.100 moks trom AS pert contrining of 58CO· As per…

A: Answer :-  Half-life of 58Co =  70.87 days…

Q: The isotope 185Hf undergoes B decay with a half-life of 3.50 min. (a) What isotope is produced by…

A: All radioactive decay process follow 1st order kinetics.

Q: What is the half life of radioistope if it decays to 12.5% of its radioactivity in 12 years?

A:

Q: The half-life of radium-226 is 1620 years. How long will it take for the original amount to be…

A: By help of Following formula,we can calculate time for 55% decomposition of radium-226 - (1) t1/2 =…

Q: Exactly 0.1 of the radioactive nuclei in a sample decay perhour. Thus, after nhours, the fraction of…

A: (0.900)n = 0.5 taking lag of both side  n x log 0.900  = log 0.5 n = log 0.5 /log 0.9 n  = 6.58 hour…

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

A:

Q: If 28.0% of a sample of sodium-24 decays in 7.11 hours, what is the half-life of this isotope (in…

A: Given data,  Let, Initial amount of sample is [A]o=100% 28 % of sample is decay so remaining amount…

Q: What is the age (in y) of mummified primate skin that contains 7.45% of the original quantity of…

A: All radioactive decays follow first order kinetics:

Q: One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The…

A:

Q: If 28.0% of a sample of erbium-165 decays in 4.74 hours, what is the half-life of this isotope (in…

A: Half life period of a reaction:-   The time during which the concentration of a reactant is Reduced…

Q: 1. Co decays with a half-life of 5.27 years to produce 2Ni. (a) Calculate the fraction of a sample…

A: Given a radioactive decay of cobalt to nickle. All radioactive decay follow first order kinetics…

Q: The half-life of cesium-137 is around 30 years, its rate of decay is proportional to the amount…

A: All decay reactions follow first order kinetics For first order reaction,   rate constant, k =…

Q: A sample of a newly discovered element, West Virginium, has a half-life of 288 years.  How long…

A:

Q: The half life of 21 At is 7.214 hours. What fraction of a sample of21At will remain after 3.141…

A:

Q: The isotope 166-Yb decays by electron capture with a half-life of 57 hrs. What percentage of the…

A: We have to calculate the percentage of isotope left

Q: he half-life of radioactive Bk-248 is 23.7 h.   How long does it tak

A: Radioactive decay follows the first order kinetics  its decay constant   λ = 2.303t log NoNwhere…

Q: The half-life of 90Sr is 28.8 years. How long will it take (in years) for a 86.1 mg sample of 20Sr…

A: Given t= 28.8 years. t1/2 = ?

Q: A certain radioactive material contains 1010 atoms and has a half-life of 20 days. (i.) Calculate…

A: No of atoms in radioactive elements = N 1010 atoms Half Life = t1/2 = 20 days No of disintegration…

Q: If 28.0% of a sample of gallium-66 decays in 4.46 hours, what is the half-life of this isotope (in…

A:

Q: cl4 undergoes first order radioactive decay. For simplicity let its half-life be 6,000 years. The…

A:

Q: The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remains after 9.50…

A: First of all let's see the given data in the question, Half-life of cobalt-60 ( t1/2 ) = 5.20 years…

Q: The half-life of cobalt 60 is 5 years. (a) Obtain an exponential decay model for cobalt 60 in the…

A: Half-life of cobalt 60 is 5 years .Radioactive decay follows first order kinetics .We have to find…

Q: Potassium-40 decays to argon-40 with a half-life of1.27x109 yr. What is the age of a rock in which…

A: Half-life: It is defined as the time required for a quantity to reduce half of its initial value.…

Q: What is the half-life of magnesium-20 if 1.27 seconds are required for the activity of a sample of…

A: magnesium-20 is a radioactive isotope of magnesium. Radioactivity follows First-order kinetics.…

Q: A breeder reactor converts relatively stable uranium 238 into the isotope plu- tonium 239. After 15…

A:

Q: The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remain after 9.50…

A: Given information,     The half-life of cobalt-60 is 5.20 yr.     Mass of sample 2.000-mg     Time…

Q: Nickel-57 undergoes β+ decay (t1/2 = 36.0 hr) to form cobalt-57. How long will it take for 0.150 mol…

A: Radioactive decay is related to first order kinetics. For first order reaction: First order…

Q: 9. Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is…

A: The rate constant is calculated as follows,

Q: A sample of 113m In has a half life of 100 minutes. What amount of 113m In remains (in CPM) if a…

A: An exponential decay can be described by the formula:

Q: What is the age (in y) of mummified primate skin that contains 7.29% of the original quantity of…

A: Given: Half-life of 14-C = 5715 years The amount of 14-C at time t = 7.29% Original quantity The…

Q: Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes…

A: Answer:- this question is answered by using the simple concept of nuclear chemistry which involves…

Q: A 53.8-mg sample of sodium perchlorate contains radioactivechlorine-36 (whose atomic mass is 36.0…

A: The number of disintegration of a radioactive compound can be determined by the number of…

Q: i) The possible decay series from radon-222 to produce lead-210 is as follows: 2ERN → 21Po 214Pb →…

A: Radioactive nuclear reactions are the reactions in which there will be changes in the mass number…

Q: If 28.0% of a sample of copper-64 decays in 6.16 hours, what is the half-life of this isotope (in…

A: We will use formula of rate constant first order kinetics

Q: A decay sequence for a radioactive atom of radon 219 to stable lead 207 atom is as shown below.…

A: Radioactive deacy is the spontaneous breakdown of atomic nucleus from nucleus and release energy and…

Q: Q7. A 150 grams of a radioactive gas is accumulated in a container. After 3 months, only 141 grams…

A: Initial amount of gas = 150 grams. Reduced amount of gas = 141 grams. Time = 3 months. Monthly rate…

Q: What is the half life of a radioactive sample, if3/4of its nuclei decay in 2 years?

A: The amount of nuclear decay in 2 years = ¾ th of initial massAssume that the initial mass = 1The…

Q: 0.0736t wheret is in days. A particular compound decays according to the equation y = ae Find the…

A:

Q: What is the half life of a 100 g sample of nitrogen- 16 that decays 12.5 in nitrogen-16 in 21.6 s?

A:

Q: Uranium -238 decays TO Fom thorium - 234 with a half lipe of 4.5x 10ª. How many year it take to…

A: Given   Half life  of U-238 ( t1/2 )   =  4.5 × 109  year Decay %   = 75 %  Time ( t )   = ?

Q: what is it's half-life?

A: