The isotope cesium (Cs)-137 has a half-life of 30 years. How long will it take for this isotope to decay to about one-half its original amount?

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Q: Krypton-81m (81mKr) is a radioactive isotope with a half-life of 13.1 s that is often used in…

A: The correct option is (e) 50.26 s

Q: 6. The bismuth-209 nucleus has a binding energy per nucleon of 7.6154 MeV. (1 MeV is 1.60 × 10-13…

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Q: Your company develops radioactive isotopes for medical applications. In your work there, you measure…

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Q: The stable isotope of sodium is 23Na. (a) Find the total binding energy and the binding energy per…

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Q: The radioactive isotope 209 Po has a half-life of 103 years. How long would it take 84 for only 4.00…

A: Given: The half-life time is 103 years. The remaining sample is 4 g. The total amount of the sample…

Q: One half-life of an isotope is 22 years. How many years would it take to have only 25% of the…

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Q: 75% of a quantity of U-232 remains after 30 years. What is the half-life?

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Q: opper-63 has a nucleus mass of 62.92959 u. Its atomic number is 29, and its atomic mass number is…

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Q: Suppose we have a sample containing 1.91 mCl of radioactive 131 (t,2 - 8.04 d). (a) How many decays…

A: Solution: Given that half-life of the sample, t1/2 = 8.04 days = 694656 s. Time for decay, t = 5week…

Q: Radioactive substances follow a specific law of decay. Namely, if you have a sample of some…

A: The given problem is based on radioactive decay and half life.  The given equation is 128

Q: Carbon is one of the fundamental elements in everything that's alive on Earth. The three naturally…

A: Carbon has generally three isotopes found in nature. Isotopes are those which have the same proton…

Q: What is the nuclear binding energy for a mole of hydrogen (H-1), whose mass is 1.00794? (mass of a…

A: The binding of one hydrogen atom can be determined as, Here, Δm, mp, mH, and c represent the mass…

Q: In the 1986 disaster at the Chernobyl reactor in eastern Europe, about 1 8 of the 137 Cs present in…

A: It is a measure of radiation dose to tissue. It is less fundamental than absorbed dose, but has…

Q: A radioactive sample is prepared; 10.78 hours later, only 1/16th of the original sample remains.…

A: Activity N=N0e-λt  10.78 hours later, only 1/16th of the original sample remains N016=N0e-λ10.78…

Q: The number of radioactive nuclei present at the start of an experiment is 5.38 x 1015. The number…

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Q: Consider a small pot with a copper base. The base has a thickness of 2.0 mm and a diameter of 15 cm.…

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Q: What is the mass of 25.0 mCi of technetium-99m (Tc99m)Tc99m , which has a half-life of 6.00 h?

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Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…

A: Given that, Half life of the isotope, T = 140 days  We know that,  The half life is the time in…

Q: A certain radioactive material decays exponentially. The percent, P, of the material left after…

A: Given:-  A certain radioactive material decays exponentially. The percent, P, of the material left…

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.