A radioactive material produces 1280 decays per minute at one time, and 4.6h later produces 320 decays per minute. What is its half-life?

Q: A radioactive material produces 3.522E+3 decays per minute at one time, and 5.47 h later produces…

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Q: Ql: A radioactive material produces 1280 decays per minute at one time, and 4.6 h later produces 320…

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Q: If a 6.13 g sample of an isotope having a mass number of 124 decays at a rate of 0.350 Ci, what is…

A: The mass of the sample, m=6.13 g   The mass number, A=124 u   The rate of decay, dNdt=0.350…

Q: The activity of this sample after 3  half-lives have elapsed is approximately what?

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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: An element loses 22% of its mass every year, what is the half life?

A: Let the original mass of element be No and it loses 22% of mass its mass in a t=365 days i.e.,…

Q: The mass of carbon in an animal bone fragment found in an archeological site is 200 g. If the bone…

A: Mass of carbon m=200 g. We know that 12 g of Carbon has 6.022*1023 Nuclei so 200 g of carbon would…

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: The energy emitted in the  alpha decay of 239Pu in MeV is

A: The alpha decay of 239Pu is as shown below, 23994P→23592U+42α The mass of the 23994P is…

Q: A radioactive sample with a half-life of 3.1 s initially has 10,000,000 nuclei. What would be the…

A: The activity is  R=11955.3677Bq

Q: it has taken 30 days for a particular nuclide to decay to 25% of its original activity. what is the…

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Q: the decay constant or the beta decay of ^99 43Tc was found to be equal to 1.0x10-13/s. What is the…

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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: 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: Krypton-79 has a half-life of 35 h. How many half-lives have passed after 105 h?

A: Krypton-79 has a half-life of 35 h. How many half-lives have passed after 105 h?

Q: A radioactive substance is found to register 5000 counts per second on a Geiger counter.…

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Q: What is the nuclear equation for Gd (alpha decay)? 64

A: Answer C

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

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Q: A freshly prepared sample of a certain radioactive isotope has an activity of 3.7 × 1011 decays/s.…

A: Relation between activity of the radioactive isotope and half life…

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: At an archeological site, a sample from timbers containing 500 g of carbon provides 2690 decays/min.…

A: R=Rate of decay of carbon=2690 decays/min=269060=44.83 BqActivity per unit mass of Carbon=0.255…

Q: A piece of radium has an activity of 92 mCi. (a) What is the mass of the radium?

A: Given: The activity of the radium is 92 mCi. The molecular mass of the radium is 226.

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: A radioactive sample has a half-life of 3 days. Its current activity is 100 μCi . What was its…

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Q: As the mass number of nucleons increases, what happens to the binding energy per nucleon?

A: discuss about the binding energy  with increase in mass number of nucleon.

Q: What is rate of decay after 2.5 seconds?

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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: How many half lives must pass for the mass of a radioactive sample to decrease to 35% of the…

A: Half life of a radioactive sample is the time required for the sample to reduce to half of its…

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: 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: A radioactive sample has a half-life of 3 days. Its current activity is 100 mCi . What was its…

A: The number of half lives in 6 days is N=63=2 days

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 decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the decay…

A: Given:- the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the…

Q: The radioactive isotope of lead ^209Pb decays according to the differential equation dN/dt=-kN.  The…

A: Remaining fraction = (100-78)/100  e^-(.693t/3.3) = .22 take ln both sides  - .693t/3.3 = ln (.22) =…

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: If the atomic mass of Sodium-18 is 18.02597 u, what is the binding energy?

A: Please note : As per answering guideliens I can answer the first question only. Since,,this is not a…

Q: What becomes of the “lost” mass per nucleon in fission and fusion reactions?

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Q: A radioactive sample was measured 41.7 years ago. It had an activity of 2943.8 Bq. Today, its…

A: A radioactive sample was measured 41.7 years ago. It had an activity of 2943.8 Bq. Today, its…

Q: What is the decay constant for a radioactive isotope with half life of 30 hours?

A: Half life of radioactive decay is defined as time taken to decay half of the initial quantity.…

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

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Q: A beta particle is emitted when carbon-14 transforms in to a nitrogen-14 nucleus. The atomic mass…

A: Atomic mass of Carbon-14 MC=14.003242 u and atomic mass of Nitrogen-14 MN=14.003074 u. The reaction…

Q: Iodine-131 is used in the form of sodium iodide to trwat cancer of the thyroid. The isotope has a…

A: The radioactive decay of a substance is governed by the equation, M=M0e-λt where, M is the remaining…