A certain radioactive material contains 1010 atoms and has a half-life of 20 days. (i.) Calculate the number of disintegrations after 1s. (ii.) After how long will the material take to reduce to 104 radioactive atoms?

Q: Gallium-67 is used medically in tumor-seeking agents. What is the half-life of gallium-67 if 229…

A: Time = 229 hours  Reduced activity = 13.2 %  Half life time of gallium - 67 = ?

Q: A proton is accelerated to 75.1 MeV per particle. What is this energy in kJ/mol?

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

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Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

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: Please solve the following problem!A huge amount of radioactive iodine (131I) andcaesium(137Cs) was…

A: Please find the attached images.

Q: Radioactive cobalt-60 is used extensively in nuclear medicine as a ɣ-ray source. It is made by a…

A:

Q: A proton is accelerated to 15.1 MeV per particle. What is this energy in kJ/mol?

A:

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: The isotope 232Th decays to 208Pb by the emission of six alpha particles, with a half-life of 1.39 ×…

A: Given: Final amount of thorium = 7.4 mg Volume of helium gas     = 4.9 x 10-3 cm3 Half life of decay…

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: The half-life of 232Th is 1.4 x 100 yr. Find the number of disin- tegrations per hour emitted by 1.0…

A: Some nuclei are unstable and undergo a loss of energy in the form of radiation. This process is…

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

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Q: A proton is accelerated to 86.2 MeV per particle. What is this energy in kJ/mol?

A: Given : Kinetic energy of proton in MeV = 86.2 MeV Since 1 MeV = 106 eV => Kinetic energy of…

Q: takes 360 kJ to keep a 100-watt lightbulb burning for 1 hour. Assuming that the lightbulb won’t…

A: Mass defect of a atom is defined as the difference in the actual mass of the atom to the mass…

Q: The decay constant for the element X is 6.931 yr⁻¹. What is the half-life?

A: Relation between decay constant (K) and half life (t12) of an element:-t12 =0.693K

Q: How many years will it take for 50 microcuries of tritium (Hydrogen-3) to decay to 3.125…

A: The given reaction will follow the first order kinetics

Q: How many radioactive disintegrations occur per minute ina 0.0010-g sample of 209Po that has been…

A: We know, k=ln2t1/2k - decay constant and t1/2 is half life

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: The natural abundance of 14C in the earth's atmosphere and all living organisms is approximately…

A: Half-life is the time taken for the reactant to reduce the amount of the isotope to half its initial…

Q: The isotope 100 Tc has a half life of 16 sec, what is the radioactive decay constant, k?

A: Given: Half life of isotope 100Tc = 16sec As all radioactive process are first order reactions using…

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: Q1: If you know that the half-life of a radioactive element is equal to 20 days, find the following:…

A: Radioactive active decay generally follows a first order reaction and therefore, the rate of…

Q: The noble gas radon has been the focus of much attention because it may be found in homes. Radon-222…

A: Half life time = 3.82 days  Concentration decreases to 10% of original.  Let initial concentration =…

Q: A sample of (_16^35)S , a ß- emitter, has an activity of 0.100 µCi. In 20.0 days, the activity of…

A: solution- given- initial activity of sample of 1635 S = 0.100 µCi declined  activity of sample of…

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

A:

Q: The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain…

A: We are given Radium -226 t1/2=1590 years                  (i) We know radioactive decay always…

Q: A proton is accelerated to 66.7 MeV per particle. What is this energy in kJ/mol?

A: Given: Energy in MeV = 66.7 MeV

Q: Gallium-67 is used medically in tumor-seeking agents. What is the half-life of gallium-67 if 219…

A:

Q: A breeder reactor converts relatively stable Uranium-238 into the isotope Plutonium-239. After 5…

A: NOTE

Q: A sample of 16? 35 , a ß-emitter, has an activity of 0.100 μCi. In 20.0 days, the activity of…

A: Radioactive follows first order kinetics, If λ is the disintegration constant, t is time at which…

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

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Q: Actinium-227 is a radioactive substance that decays according to the following function, where v, is…

A: The relationship between the initial amount and final amount of reactant is given as, => y = y0…

Q: A radioactive of an unknown element is an extremely hazardous species. If a 79 gram sample of the…

A: Given: Initial amount, a=79 g The final amount, a-x=37 Time =37.9 yr Rate constant=? half-life =?

Q: The radioactive decay of Radon-222 follows a first order differential dA/dt = - kA where A is the…

A:

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: .Determine the decay constant of 1 g of pure K40 that is experimentally determined  to emit about…

A: According to the question we have to calculate the decay constant for the potassium and the given…

Q: Stonehenge is an ancient megalithic site in southern England. Some believe it was designed to make…

A: Given: Sample=6 pound Carbon-14=0.33 Pounds t12=8333 years To find: Age of charcoal pits Solution:…

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: very unstable francium-221 is produced. Giver f-life of francium-221 is only 5.00 minutes, if th…

A: Given,  Half life time (t1/2) = 5.00 minutes Decay constant (k) = 0.693/5.00     =  0.1386 min-1…

Q: Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET).…

A:

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: Radiocarbon dating techniques are used to determine that a very old piece of bone emits emits about…

A:

Q: The half-life of element X is 500 years. If there are initally 8g of X how much will remain after…

A: The half-life of an element is the time it takes for half mass of the element to decay.

Q: Some watch dials are coated with a phosphor, like ZnS,and a polymer in which some of the 1H atoms…

A: Given that : Half life of tritium = 12.3 yr Time period (t) = 50 yr Mass of tritium = 3.024 g

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.