A sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the half life of this isotope?

Q: Q3) The activity of 1 gram of radium (226Ra) is exactly 1 Ci. The half-life of radium (in years) is-…

A: We have m=1 gm of Radium (R88226a) whose activity is given to be A=1 Ci. We need to find the half…

Q: A 416 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hours. What is the half-life…

A: Given data: The initial quantity is N0=416 g. Quantity after decay is N(t)=13.0 g. Time elapsed is…

Q: The half life of an unknown substance is 1 week. How much of its nuclei were disintegrated after 10…

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Q: A 640g sample of an isotope decays to 40g in 625minutes. Find the half-life of the isotope.

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Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…

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Q: A 30 g radioactive isotope has a half-life of 6 years. How much of the isotope will be left after 12…

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Q: If a material has a half life of 92.5 days, how long will it take for 75% of the material to decay?…

A: Half life of the material=92.5days 75% of the material decay

Q: Tritium has a half-life of 12.5 y undergoing beta decay. What fraction of a sample of pure tritium…

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Q: What fraction of a radioactive sample is left after exactly 6 half lives? Give your answer to 3…

A: Number of half life (n) = 6

Q: Iodine-131 is one of the most important isotopes used in the diagnosis of thyroid cancer. One atom…

A: Mass of 131Iodine: M = 130.906114 amu  Number of protons in 131Iodine:: p = 53 Nuber of neutrons in…

Q: Using a nuclidic chart, write the symbols for (a) all stable isotopes with Z =60, (b) all…

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Q: A radioactive sample has a mass of 999 grams. How much remains after 2 half-lives?

A: If the amount of a radioactive sample is N0 initially, then after 1st half live of the sample, it…

Q: Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the…

A: The radioactivity decay of a sample has a relationship given by:Nt=N0e-λt………(1)where,N0 is the total…

Q: After 2 hours, 1/16 of the initial amount of of certain radioactive isotope remains undecayed. The…

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Q: The steps below show three of the steps in the radioactive decay chain for 232 90Th. The half-life…

A: Given: The steps below show three of the steps in the radioactive decay chain for 232 90Th. The…

Q: When thorium decays by emitting a beta particle, what is the atomic number of the resulting nucleus?

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Q: Calculate the binding energy per nucleon for the atom of Uranium-235

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Q: When radium 226 decays emitting an alpha particle, what is the atomic number and atomic mass of the…

A: The alpha particle having mass number 4 and atomic number 2 and it is a helium nucleus.

Q: 231 The half-life of isotope Pa is 32.76 years. Calculate the activity of 3e-06 g of this isotope in…

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Q: The half-life of radium is approximately 1600 years. If the present amount of radium in a certain…

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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: The mass of an idotope of an sulfur atom is A= 1+2Z. Please calculate the number of neutrons found…

A: Given that:- A=Mass number of sulfur=1+2Z where, Z=Atomic number of sulfur=16

Q: After three half lives have gone by, what fraction of a sample of a radioactive isotope remains?

A: A half-life is a time period during which nuclei of radio-active sample becomes half of its initial…

Q: The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.0 × 1010 133Ba atoms.…

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Q: Radium decomposes at a rate proportional to the amount present. In 100 years, 100 mg of radium…

A: Given: The time is t=100 yr. The initial amount of radium is No=100 mg. The final amount of radium…

Q: After 2.00 days, the activity of a sample of an unknown type radioactive material has decreased to…

A: Formula to calculate the activity

Q: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…

A: To the nearest hour, the radioactive half-life of the substance is 52.5hours

Q: he isotope C has a half-life of 20.4 min. Determine the time interval (in min) required for the…

A: Given that                 The half life (t1/2) = 20.4min                 Activity of a sample of…

Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…

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Q: A radioactive isotope has a half-life of 51.5 days. What fraction of the isotope remains after 413…

A: We have: The half-life is t1/2=51.5 days Calculating the first-order reaction constant k as…

Q: The decay rate of an isotope is initially R0 but after one half-life has gone by, the rate is R0/2.…

A: *According to question:-Decay Rate of Isotope initially=Ro& Decay Rate after one-half…

Q: Radon gas has a half-life of 3.83 days. If 3.28 g of radon gas is present at time t = 0, what mass…

A: Write the formula for the decay constant. Write the formula for the mass of the radioactivity of…

Q: A pure sample of a newly discovered radioactive isotope is discovered. It has a half-life of 78 y.…

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Q: If Th-234 emits a beta particle, what nucleus is formed?

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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:  Half life of the isotope, T = 140 days

Q: The polonium isotope 210/84 Po undergoes alpha decay to become an isotope of lead. The atomic…

A: Given : Polonium isotope 210/84 Po By alpha decay it becomes an isotope of lead

Q: After 1.80 days, the activity of a sample of an unknown type radioactive material has decreased to…

A: Given data: The number of days passed is t=1.8 days. The activity is decreased by x=80.4%.

Q: A radioactive substance disintegrates 1/64 of initial value in 60 s. The half-life of this substance…

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Q: Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally…

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Q: What isotope is produced when U-239 emits a beta particle?

A: The decay equation of Uranium 239 is given below:

Q: A dose of 8.60 mCi of a radioactive isotope is injected into a patient. The isotope has a half-life…

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Q: The half-life, which is unique to any given isotope, is defined as:

A: We know  half life :-The time taken for half of the original population of radioactive atoms to…

Q: A radioactive isotope of silver has half-life of 20 minutes. What fraction of the original mass…

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