The half life of a radioactive nucleus is the time taken for radioactive nuclei in the given sample to become of half of its initial value.

Q: The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be…

A: Given data :- N0 = 135 gT = 3.t1/2  ;  t1/2 being the half life of isotope

Q: What is the mass number of an alpha particle?

A: Mass number is the total number of nucleons. It is the sum of number of protons and neutrons.

Q: A radioactive sample has a half-life of 10 minutes. What fraction of the sample is left after 40…

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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: Find the mass of a radioactive isotope if 3 half-lives occured. The initial mass of material was 80…

A: Given, The initial mass of material was 80 g. Half life is time required to fall the initial value…

Q: Cobalt-60 is a synthetic radioactive isotope of cobalt with a half-life of 5.3 years. What was the…

A: Given data The half-life of the cobalt is t1/2 = 5.3 years The quantity of the radioactive isotope…

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 half-life of Carbon-14 is 7 years. How much of an initial 168 g sample will remain after 30…

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Q: ', where A(t) is the amount of the isotope at time t (in years) and A, is the original amount. if…

A: A(t) = Aoe-0.00002866 t where t is in years

Q: Q6: 100 g of radioactive element X are placed in a sealed box. The half-life of this isotope of X is…

A: Disclaimer: Since you have posted two questions and no specific question number is mentioned, we…

Q: A radioactive material decays at a rate proportional to its amount . If the material has a half-life…

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Q: You have 24,640 grams of a radioactive kind of bromine. If its half-life is 2 hours, how much will…

A: Given:Intital quantity of radioactive kind of bromine (A0) = 24640 gmhalf-life, T = 2 hrsFull life,…

Q: A mine worker discovers an ore sample containing 500 mg of radioactive material. It was discovered…

A: Given data: Mass of radioactive material, mo=500 mg Number of half-life, n=7 Applying the formula:…

Q: The half-life of a radioactive material whose rate of disintegration is proportional to the amount…

A: The half-life of a radioactive element is defined as the time required to decrease the initial…

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: 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 sample starts with 800,000 undecayed nuclei. After 12 hours, 700,000 of the nuclei…

A: Given data-                         initial no of nuclei in the sample (N0) = 800000…

Q: Certain radioactive substances has a half-life of 20 min. If there is 56 lbs of it right now, how…

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Q: A radioactive material has a half-life of eight days. How long will it take for the material to be…

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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: The half-life of scandium-46 is 83.9 days. How much of a 9.0–oz sample of scandium-46 will remain…

A: Given data The half-life of the scandium-46 is t1/2 = 83.9 days. The initial amount of the…

Q: Question 7 of 22 A researcher initially has 10 grams of a particular radioactive isotope. After 14…

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Q: The isotope cesium-137 has a half-life of 29.75 years. How long will it take a 100 gram sample of…

A: Given data The half-life of the cesium-137 is t1/2 = 29.75 years. The initial amount of the…

Q: How long will it take for an amount of Radon-223 to decay to only 60% of the original amount? The…

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Q: The half-life, T, for a particular radioactive element is 16 min. Find the decay rate of the element…

A: The decay rate is 4.3% per min.

Q: The activity of a radioactive element falls from 600 s1 to 500 s1 in 40 minutes. The half-life of…

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Q: cadmium -107 has a half -life of 6,52 hours .if you start off with sample which sample which has an…

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Q: A radioactive substance plutonium-239 has a half-life of 24,000 years. Initially, there is 700 mg of…

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Q: A sample of Uranium ore is estimated to have originally contained 805 mg of uranium-238. Analysis…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Write a nuclear equation for the alpha decay of the following isotopes      a)   Thorium-232…

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Q: The​ half-life of a radioactive substance is 20 years. If you start with some amount of this​…

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Q: The nuclear waste produced by a nuclear reactor consists mostly of fission fragments and plutonium…

A: Given The nuclear waste produced by a nuclear reactor consists mostly of fission fragments and…

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: What are the types of radiation emitted by the nuclei of radioactive elements?

A: The nucleus of an atom consists of protons and neutrons. Neutrons are neutrally charged and protons…

Q: Determine the nuclear composition (number of protons and neutrons) of the following isotopes. (a)…

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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 sample of a radioactive element has a half-life of 180 days; what percent of this sample will…

A: The decay constant of a radioactive sample is given by :  The amount of sample left after 't' time…

Q: radioactive sample

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Q: An element with an atomic mass of 57 has an isotope with an atomic of mass 58. The source of this…

A: Isotope is a terminology given to an element that has variation in atomic mass than the same element…

Q: The Neutron number N is the number of neutrons in the.

A: The neutron number is the number of the neutrons in the Nuclide or Nucleus.

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

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Q: A sample of carbon-14 has been decaying for 22 920 years and is now 35,0 grams. (The half life of…

A: Given: Decaying year T = 22920 years, Present Mass of carbon-14 Nt = 35.0 g. Half life of C-14 T1/2…

Q: The half-life of a certain radioactive isotope is 30 minutes. If we start out with 100 g of the…

A: Given: Half-life (T1/2) = 30 min. = 0.5 h. Mass of the isotope (m) = 100 g. Time (t) = 2.0 h.

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

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Q: A scientist discovers a new isotope, exponentialitium. The scientist sets aside 150 grams of…

A: The amount of time required to fall the amount of a radioactive element to half is called the…

Q: The initial amount of carbon-14 is 100 g and the amount of carbon-14 dropped to 1 g after decay…

A: Given, Initial mass (mo) =100g Final mass (m) = 1g half life (t1/2) =5730 years

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.