1. Rubidium-87 is a radioactive isotopes ocurring in natural rubidium. The decay constant is 4.6x1019 Is. What is the half-life in years ?

Q: Even though thorium does not undergo fission, it has been proposed as a fuel for nuclear reactors…

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Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A: To solve this problem first we find the rate constant ( k) using half life time . Then we will…

Q: Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9…

A: Since the decay reactions are first order reaction. Hence for the first order reactions we can say…

Q: 21. Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 10.0 g and it…

A: 21. Given that: Half life of Barium-122 = 2 mins. Time taken for the set up = 10 mins

Q: 9.) Strontium 90 is a major component of the detonation of nuclear explosives: it is I dangerous…

A: We know that no of atoms  N Present at time t  are given as N= N° e-kt where N° are the initial…

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A: ★ Answer : 13.712 mg of Gallium-67 remains after 112 hours. ★ Solution :

Q: The isotope 208Tl undergoes β decay with a half-life of 3.1 min.(a) What isotope is produced by the…

A: isotope is produced by the decay has to be determined The time taken for 99.0% of a sample of pure…

Q: The half-life of a radioactive element is 1,250 years.What percent of the atoms remain after 5,000…

A: Number of half lives = 50001250 = 4 100%  →1250 years 50%  →1250 years 25% →1250 years 12.5 % →1250…

Q: Given that radioactive cobalt-60 has a radioactive constant equal to 3.8 x 10 determine its…

A: Now in order to calculate the half life we first write down the given data: Radioactive…

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

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Q: Selenium-73 decays by positron emission with a half-life of 7.15 hours. What mass remains from a…

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Q: The radioisotope radon-222 has a Half-Life of 3.8 days. How much of a 73.9-g sample of radon-222…

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Q: The half-life of Uranium is 235 (U235) decaying to lead 207 (Pb 207) is 704 million years suppose an…

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Q: Radioactive C14 undergoes exponential decay with a half-life of 5730 years. What is the decay

A: Radio active decay follows first order kinetics Decay constant  = 0.693/t1/2

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A:

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A:

Q: How long will it take for 50% of a sample of ³'I to decay?

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Q: What is the product of the first step of the reaction, the absorption of a neutron by 232Th? The…

A: radioactive nuclide undergo absorption  or emission reaction by obeying the law of conservation of…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A:

Q: A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at…

A: GIVEN:  To Find: Solution: As we know, For First order decay

Q: How long does it take for 105 mg of tritium H to decay to 35.0 mg? The half-life of tritium is 12.3…

A: All radioactive decays are first order reaction.

Q: 214Bi is a radioactive isotope of the element bismuth with a half-life of 19.7 minutes. What…

A: Welcome to bartleby !  Introduction :  We have to calculate percentage of bismuth lost . Given :…

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

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Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A: Given Half life of Radon -222 ( t1/2 )  = 3.82 days  Initial amount of isotope ( A0 )= 33.5 mg  Time…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

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Q: How long does it take for a sample of 27?? 60 to disintegrate to the extent that only 2.0% of the…

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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: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A: Gallium - 67 has a half-life of 78.2 hours. Initially 36.7 mg of Gallium - 67 were present.   Here,…

Q: The free neutron is an unstable particle that decays into a proton. What other particle or particles…

A: Radioactivity is a process in which unstable atomic nuclei spontaneously disintegrate into atomic…

Q: 239Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239Pu present…

A: Given data, t1/2 of P239u = 24,000 yTime (t) = 1000 years To calculate the fraction of the 239Pu…

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: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

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Q: Barium -122 has a half-life of 2 minutes.  Suppose you obtain a sample weighing 10.0g and it takes…

A:

Q: A certain isotope decays by beta-decay with half-life of 24.11 days. One of the products is…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A: Given, relative abundance : U238=99.28 % U235=0.72% Half life : t1/2 of U238=4.5×109 yr t1/2 of…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

A: The half life of radon = 3.82 days. Initial amount = 37.9 mg  time = 4.70 days mass remains after…

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: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A: Decay constant for 238U can be calculated as: λ=0.693t12=0.6934.5×109years-1 Decay constant for 235…

Q: The isotope 261-Lr decays by a emission with a half-life of 2.7 min. How many minutes will it take…

A: As we know the Decay equation: λ=1tlnaoa a0= Initial concentration a= Concentration left after time…

Q: The decay constant or the beta decay of ^99 43TC was found to be equal to 1.0x10-13/s. What is the…

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Q: How long does it take a 30.0 mCimCi sample of gold-198 to decay so that only 7.50 mCimCi remains?

A: Given datas ;  [A0] = 30.0 mCi  [At] = 7.50 mCi  t = ?  Since, we know that ; The half life of…

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: Thallium-201 is used medically to diagnose heart problems. The half-life of thallium- 201 is 72.9…

A:

Q: The most significant source of natural radiation is radon-222. Radon-222, a decay product of…

A: Answer a: How many alpha and beta particles are produced when uranium-238 decays to radon-222? What…