The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a sample of this isotope to fall to one-fourth of its initial value?

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 radioactive substance has a half-life period of 30 days. What is the disintegration constant ?

A: We know thatλ=ln2T1/2Hereλ=disintegration constantT1/2=Half life of substance

Q: The nuclide 14C contains (a) how many protons and (b) how many neutrons?

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Q: What is the relationship between decay constant and mean life of a radioactive nucleus?

A: The mean life of a radioactive nucleus is calculated by using the formula τ=1λ , where λ is the…

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: The half-life of 38 Sr is 28 years. What is the disintegration rate of 15 mg of this isotope?

A: The rate of disintegration of a radioactive substance is the number of atoms present at that time.…

Q: One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The…

A: Solution Given, half life of palladium(t1/2) = 17 days A0 = initial activity  At = activity at time…

Q: Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sample of rutherfordium…

A: Given: Half life of Rutherfordium-261 t = 1.08 min.

Q: What mass of a 2,400g sample of an isotope will remain after 32.8 days if the half life of the…

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

Q: The half-life of a particular element is 330 days. What is its decay constant?

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

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

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Q: A radioactive sample contains 2048 nuclie. How many of its nuclei decay after two half lives?

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Q: Binding energy per nucleon for an element is 7.14 MeV. If the binding energy of the element is 28.6…

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Q: The half-life of radium 224 is about 3.6 days. What approximate fraction of a sample remains…

A: Half Life of Radium 224, t1/2 = 3.6 days Time interval, t = 2 weeks = 14 days

Q: Uranium has a half-life of 4.47 billion years! How long does it take for a sample of 100 grams to…

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

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Q: The Half-life of certain radioactive sample is 30 minutes. At 2.00 PM, the decay rate is measured to…

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Q: A radioactive substance has a half-life period of 30 days. What is the disintegration constant?

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Q: A nuclide whose "generic" symbol is 6430X would have protons and neutrons.

A: The generic symbol of a nuclide is given as X3064.

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: What is the half-life of a radioactive isotope if the activity of a sample drops from 14,080 cpm to…

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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: 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: number of alpha-decays of Q in the first one hour is;

A: Given: Determine number of alpha decays of Q in the first one hour ?Where,   A heavy nucleous Q 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 half-life of Uranium-237 is 5.83 x 105 If you have a sample with 5.89 x 1024 atoms in it, how…

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Q: A radioactive material decomposes half of its amount per minute. If after 2 mins, 100% undecayed…

A: Half of amount decay in 1 min

Q: The half-life of a particular radioactive isotope is 6.5 h. If there are initially 48 * 1019 atoms…

A: Given:  Half life of isotope, T = 6.5 hours  Initial number of atoms, No = 48 x 1019 atoms  Total…

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

A: Given information: Here, λ is the radioactive constant or decay constant.

Q: If the half life of an element is 32.2 years, how many years it take for a sample to decay to the…

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Q: You are experimenting with a radioactive sample of polonium. At the end of 14.0 minutes, exactly…

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Q: How many radioactive nuclides are in a sample with a radioactivity of 3.1 kCi? The half-life of the…

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Q: A substance decays according to the formula Q = 24(0.5)"2.4, where t is in weeks. (a) What is its…

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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: The half life of radium is 1.62x10^3years. What fraction of radium would remain after 1.0x10^3years?…

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Q: Radioactivity depends on the nucleus and not the atom or its chemical state. Why, then, is one…

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

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