A sample of gas from a basement containing radon-222 has an activity of 7 pCi/L, which is above the epa limit of 4 pCi/L This isotope has a half-life of 3.8 days. If no additional radon-222 entered the basement, how many days would it take for the activity to decline to a safe level of 4 pCi/L?

Q: A dinosaur remain has a C-14 isotope and has a half-life of 5,715 years. The activity of this is…

A:

Q: Iodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days. A…

A: Half life of iodine -125 = 59.5 daysInitial amount of iodine -125 = 2.00 kgFinal amount of iodine…

Q: If the amount of radioactive phosphorus-32 in a sample decreases from 2.4 mg to 0.30 mg in 42.9…

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Q: In addition to C-14, K-40 is often used for archeological dating. K-40 decays to Ar- 40 by positron…

A: The rate of radioactive decay has been proven to be of first order kinetics. Using the understanding…

Q: o-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years. a) How…

A: Elements which are not stable gain stability by emitting rays, this type of elements are called…

Q: If the half-life of a radioactive element is 30.0 years, how long will it take to decay to the point…

A: For the first order reaction we have the formula as : k*t = ln(A/At) Where A is the initial…

Q: A rock constains Pb-206 to U-238 mass ratio of 0.245: 1.00. Assuming the rock did not contain any…

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Q: After 119 days have elapsed, 1/12 of a radioisotope sample remains undecayed. What is the half-life…

A: Amount of radioisotopes remaining = 112 of the initial amount Number of days taken for the decay =…

Q: The half-life of Radium-226 is 1600 years. A sample has 100 mol remaining after decaying for 64…

A: Given, Remaining moles of Radium-226 after decay = 100 mol Half life of Radium-226 = 1600 years.…

Q: How long will it take for a 40.0-gram sample of Iodine-131 to decay to 1/16th of its original mass?…

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Q: A sample of coral has a carbon-14 content of 12.5% the value of living coral.  If the half-life of…

A: Given  Half life of Carbon - 14 = 5730 years Remaining amount   = 12.5 %  Time ( t ) = ?

Q: 60Co has a half-life of 5.27 yr. What percentage of its original activity will a sample of 60Co have…

A: Dear student,I am providing solution for Q.1 that you have asked as we are entitled to do one…

Q: Cobalt-60 is used extensively in medicine as a source of g-rays. Its half-life is 5.27 years. How…

A: Given Half life ( t1/2 )   = 5.27 year  Initial Activity ( A0 )  = 100 %  Remaining amount ( At ) =…

Q: The half life of 52Fe is 8.28 hours. Suppose we measure the activity of a sample containing 52Fe and…

A: Calculation of disintegration constant (λ):T1/2 of 52Fe is = 8.28 hours.

Q: Strontium-90, a beta emitter, has a half-life of 28.1 yr. If 29.1 mg of 90Sr were incorporated into…

A:

Q: Cobalt-60 is used extensively in medicine as a source of g-rays. Its half-life is 3.97 years. How…

A: Given: Half-life of Co-60 = 3.97 years = 3.97 × 365 = 1449.05 days…

Q: Iodine-125 (¹251) is used to treat, among other things, brain tumors and prostate cancer. It decays…

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Q: Polonium-211 has a half-life of 12 years. How much of a 32 gram sample remains after 60 years?

A: We know nuclear decay follows first-order reaction so- relation between decay constant and half life…

Q: After 19 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

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Q: A radioactive isotope has a half life of 60.2 minutes.How long will it take for radiation from a 325…

A: The radioactive decay of an isotope follows a first-order reaction, The integrated rate law for a…

Q: lodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days. A…

A: Given,

Q: A patient ingests 1.48 mgmg of 131I131I (iodine-131), a beta emitter with a half-life of 8.0 days.…

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Q: A radioactive isotope emits 999 disintegrations per minute due to beta decay. If after 1.01 years…

A: Since the relationship between activity and time is given by  A0 e-λt = A where A = activity after t…

Q: radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is…

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Q: What is the half-life of chromium-56 if 12.8 minutes are required for the activity of a sample of…

A: Radioactive decay follow first order kinectics . Half life for first order reaction  = 0.693/k  k is…

Q: radioactive isotope has a half life of 25.9 minutes. How long will it take for the radiation from a…

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Q: 2. A wooden object from an archeological site is subjected to radiocarbon dating. The activity of…

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Q: A radioactive isotope has an activity of 9.94×104 Bq initially. After 3.35 hours the activity is…

A:

Q: he half-life of chromium-51 is 28 days. If the sample contained 510 grams, how much chromium would…

A: Given that

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 radioactive sample has a decay constant of 1.32 x 10-3 h-1. What is its half life?

A: Radioactivity is a first order kinetics. Relation for decay constant ( λ) and t1/2 relation for…

Q: Strontium-89 is a beta emitter with a half-life of 50.6 days that is used in bone cancer treatment.…

A: Radioactive decay follows first order kinetics. t1/2 = 0.693/k   (where, k = decay constant) t =…

Q: lodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days. A…

A:

Q: Selenium-82 undergoes double beta decay: 82 Se 34 → Kr + 2 je + 27 This low-probability process…

A: t12=3.5×1027sA=λNλ=ln2t12=0.693.5×1027=0.19×10-27s-1to calculate no. of atomno. of…

Q: What is the half-life of magnesium-20 if 1.24 seconds are required for the activity of a sample of…

A:

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.