How many years are required for 38 mg of cesium-137 to decay to 19 mg of cesium-137?   Express the time in years to two significant figures.

Q: The half-life of strontium-90 is 28.0 years. How many grams of this nuclide in a 4.60-g sample will…

A: Half-life time t12=0.696k;   k is decay constantandt=1kln(m0m)m0 is mass of at time t=0m is mass of…

Q: = 176.5 h) to decay. Use the Calculate the time required for 46.80 % of a sample of X (t, formula…

A: Given : Half life i.e t1/2 of reactant (radioactive isotope) = 176.5 hr. And percent of reactant…

Q: If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactive…

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Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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Q: Zinc-62 decays with a half-life of 9.186 hours. After 12.80 days, a radioactive nuclide has passed…

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Q: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

Q: Iodine-131 has a half life of 2.2 × 10-2 year. How long will it take to reduce a 133 g sample of…

A: Half Life = t1/2 = 2.2 * 10-2 yeark t1/2 = ln (2)k * 2.2 * 10-2 year = 0.693k = 31.5 year-1

Q: activity of 40 uCi. Calculate the number of nuclei that will decay in the time interval from t; =10…

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Q: What is the half-life of an isotope that decays to 25% of its original activity in 17.8 h?…

A: Given:- Let initial activity of an isotope=No Activity of isotope decayed in 17.8 h= x = 25% of No…

Q: How long will it take 70 grams of cobalt-60 to decay to 17.5 grams

A: Given: Initial amount=70 g Final amount=17.5 g Half life=5.3 years Formula used: t12=ln 2r A=A0ert

Q: How long will it take 70 grams of cobalt-60 to decay to 17.5 grams? The half-life of cobalt-60 is…

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Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Data given,  Half-life period of 137Cs, t1/2 = 30.2 years Initial amount, No = 100.0 g Amount left,…

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Half-life of Cs is 30.2 years. Intial amount sample = 100 g  Final amount sample = 1.00 g

Q: NUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

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Q: Hydrogen-3 has a half-life of 12.3 years. How many years will it take for 890.0 mg 'H to decay to…

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Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Given half life = 30.2 years initial Concentration = 100 g Concentration at time t = 0.900 g

Q: How long would it take for the amount of u-235 to reach 1/8 of its initial amount? One of the…

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Q: One of the challenges of nuclear technology is safe long-term storage of by-products and waste. How…

A: It is given that; Half -life = 2.4×10-4 years Initial amount of sample = 100 After time t sample…

Q: Complete the following radioactive decay formulas. (Enter the missing reactant or product. Enter…

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Q: Iodine-125 (125I) is used to treat, among other things, brain tumors and prostate cancer. It decays…

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Q: The half-life of 87Sr is 2.80 h. Calculate how much time it would take for an isolated quantity of…

A: Time required to decay for a radioactive molecule,t = 2.303Klogaa-x Where a is the initial amount…

Q: An unknown radioactive element decays into non-radioactive substances.  In 660 days the…

A: Rate constant (k)= 2.303/t log 100/49 So k = (2.303/660) ×0.3098 =0.0011 days ^-1

Q: The total mass of radioactive uranium decays with time, different isotopes have different time…

A: First Calculate final value of mass for all three experiment All values are given in question  Then…

Q: Radium-221 has a half of 30 sec. How long will it take for 82% of a sample to decay?(Round your…

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Q: If 180. mg of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still…

A: Given information: Initial concentration of fluorine-18 is 180 mg. Half-life is 109.7 min The rate…

Q: The radioactive nuclide 235 U decays with at1/2 of 703.8 million years. Calculations reveal that…

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Q: Calculate the time required for 23.40 % of a sample of 110X (t1/2 = 15.2 h) to decay. Use the…

A: For first-order kinetics,                                                  ln[A]t[A]o= -kt…

Q: isotope with a half-life of about 22 minutes. How much time will it take for a sample of Fr-223 to…

A: Radioactivity follows first order kinetics,  Half life time (t1/2) = 22 minutes  k = 0.693/t1/2 =…

Q: Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.15…

A: Radioactive decays follows first order kinetics. For the for order kinetics: k = 0.693 / t1/2 t =…

Q: 16. Summarize how C-14 and U-238 dating together can be used to determine fossil ages.

A: Carbon 14 with a lifespan of 5,700 years can only be used to cost the remnants of about 50,000…

Q: 137 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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Q: What is the half-life of an isotope that decays to 3.125% of its original activity in 63.6 h?…

A: We know that,  N(t) = N0(1/2)t/t1/2 No = initial amount  N(t) = amount of substance at time t t1/2 =…

Q: Enter the balanced nuclear equation for the beta decay ( 0/-1e) of cesium-137 Express your answer…

A: In case of β decay, the atomic no. of the element increases by 1 and the atomic mass remains…

Q: Fluorine-18 decays to form a positron and oxygen-18. After 90.0 minutes, 1.00 18O is present…

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Q: Phosphorus-30, which has a half-life of 150 seconds, decays by positron emission. How long will it…

A: Since the decay reactions are first order. Hence half life = ln(2) / K  where K = decay constant…

Q: Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s"17…

A: Answer-a Relation between half life and decay constant is: λ=0.693t1/2 value of half life given is…

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: SHOW FULL SOL The initial amount of the radioactive material B in a rock is determined to be 19.08…

A: Initial amount of radioactive material = 19.08 mg Amount left = 0.0038 g = 3.8 mg

Q: A radioactive isotope, X-90, has a half-life of 82.6 years. How many years (y) will it take for 34 %…

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Q: 3. 137Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

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Q: phosphorus -32 decays to form sulfur -32. The half life of phosphorus -32 is 12 days. How much…

A: Given,Phosphorus-32 decays to form sulphur-32The amount of Phosphorus-32 initially present is 62…

Q: If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactive…

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Q: How long does it take for 87.5% of each isotope to decay? Kr-91 Kr-89 min Kr-79 h Kr-81 yr

A: A radioactive isotope's half-life is the time taken for one-half of the isotope to decay. A…

Q: If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactiv…

A: We know radioactive disintegration is first order kinetics. Again we know , for first order reaction…

Q: ( in Hours) will it take to disintegrate 3.17 x1017 atoms from a 12.0 mCi ( millicuri

A: One of the common unit in which the rate of disintegration is expressed is Curie.1…

Q: Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the…

A: The decay relationship is given by  lnA = lnA0 - Kt  where A = amount of substance remaining after…

Q: Strontium-90, a beta emitter, has a half-life of 28.1 years. a. Write the balanced nuclear equation…

A: Beta decay of any nuclide brings about the changes in the atomic number whereas the mass number…

Q: 137Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Since you have posted multiple independent questions in the same request, we will solve the first…

Q: 4. The remnants of an ancient fire in a cave in Africa showed a 'C decay rate of 3.9 counts per…

A: The half-life of a reaction is the time taken for the reactant to reduce to half its initial value…

Q: If 2.4 x 1010% of the atoms of a radioactive isotope disintegrate in 1.0 yr, what is the decay…

A: Since for the decay reaction, the relationship between the final % and initial % is given by…