Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive substance B. If substance B has a half-life of 3h, what’s the half-life of substance A?

Q: Determine the half-life (in s) of a radioactive sample that has a decay rate of 5.30 x 1011 Bq when…

A: Given data:     Decay rate, dNdt=5.30×1011Bq    Nuclei, N = 2.50 ×1015

Q: Suppose that 10 kg of this waste is plutonium-239, which has a half-life of 24,100 years, and an…

A:

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: Determine the half-life (in s) of a radioactive sample that has a decay rate of 4.70 x 1011 Bq when…

A: Given : Decay rate = 4.70 × 1011 Bq             Nuclei = 1.70 × 1015

Q: The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given…

A: Sample of radio active nucleus decayed = 96.875 %

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 radioactive isotope Gold-198 has a half-life of 64.80 hrs. A sample  containing this isotope…

A:

Q: If a radioactive isotope of thorium (atomic number 90, mass number 232) emits 4 alpha particles and…

A: When any radioactive elements emit alpha particle, it's atomic number reduces by 2 and mass number…

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: According to the data given Half life is 3hr And relationship given is . N(t) = N0 e(-t/£)

Q: archaeologist sometime in the future analyzes the iron used in an old building. The iron contains…

A: half life of Ni -63  t/2 = 92 years LET x half life passed (N0 /2)X =( N0 / 128 ) = (N0 /2)7  X = 7…

Q: If a 1.90 cm thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

A:

Q: The radioactive isotope (95Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Half life , T12 = 35 days =35 x 24 = 840 hours  Initial Activity , A0 = 4.5 x 108 Bq T1 = 36 hours…

Q: The radioactive isotope 234pa has a half-life of 6.70 h. A sample containing this isotope has an…

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Q: The decay constant of a radioactive source is 752 per year. Then its half- life equals: *

A: Step:1   The  Time  taken  for a radioactive atom    to  disintegrate  to half  of its  original…

Q: Calculate the number of phosphorus P nuclei decayed during the first week, if the initial number of…

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Q: In the following reaction, which type of decay is occurring? N C + - beta plus gamma beta minus…

A: In Beta plus decay, the atomic mass of the particle remains the same, whereas the atomic number of…

Q: A student carries out a radioactive decay experiment. She measures the activity of a source as a…

A: Given: The activity of the substance is given as below. Rt=714e-0.41×t…

Q: Question 10 of 22 Radium (A = 226, Z=88) decays to Radon (A = 222, Z=86) with a half-life of 1600…

A: in this  question  we discuss  about decay of radioactive substances.

Q: purchased by a medical supply house. If the sample has a half-life of 14 d, how long will it keep…

A: Just replace the values .... An its done

Q: When a nucleus decays by emitting an alpha particle, what is the atomic number of the resulting…

A: Given: 88 Ra226

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

A: Required : Decay rate at the end of the next half life.

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N…

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Q: A tree falls in a forest. How many years must pass before the C activity in 1.00 g of the tree's…

A: mass = 1 g number of atoms = number of moles * avogadro number  = (1/14)(6.022 * 1023) = 4.3 * 1022…

Q: A radioactive nucleus has half-life T1/2. A sample containing these nuclei has initial activity R0…

A:

Q: In a sample of radioactive material, what percentage of the initial number of active nuclei will…

A: Concept and Formula -                               let, initial no of active nuclei = N0…

Q: Monique, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at…

A:

Q: A patient is injected 465 MBq of radioactive isotopes with a half life of 110 minutes. How much…

A: Given: Half life, T=110 min=6600 s Radioactive injected in a body, N0=465 MBq Let's find the…

Q: The activity (or decay rate) A of a certain unknown radioactive sample was measured over a period of…

A: Given:

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Radioactivity

Q: The decay rate dt for N number of radioactive nuclei is dN dt - AN What is meant by higher decay…

A: The formula of the radio activity is  where, N is the number of atoms present and is the decay…

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Recall N=N0e-λt Where t1/2=ln2/λ       and  τ=1/λ

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: Americium-243 has a decay constant of 9.39* 10-5 years-1. How long will it take for a sample of…

A:

Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 24.2 h?…

A:

Q: Determine the half-life (in s) of a radioactive sample that has a decay rate of 5.60 x 10¹¹ Bq when…

A:

Q: How many half-lives would it take for a sample of a radioactive isotope to decrease its activity to…

A:

Q: A sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the…

A: Given data:  Initial quantity of plutonium (N0) = 24.0 mg Time elapsed (t) = 72300 years  Remaining…

Q: State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a…

A: The law of radioactive decay: "The number of nuclei undergoing radioactive disintegration per unit…

Q: Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons…

A: The nucleons combine together to form an atomic nucleus by using binding energy, and this binding…

Q: A substance decays according to the formula Q = 120(0.5)"48.. (a) What is its half-life? (Do not…

A: Q= Q0  (0.5)t/T12

Q: A radioactive isotope has decayed to the point that 1/32 of the original content is left. How many…

A: Given data: The ratio of remaining content to original content  = 1/32 Required: Number of…

Q: The decay rate of a radioactive sample decreases from 161 kBq to 22.3 kBq in 16.4 s. What is the…

A: Initial size of the sample is Ro = 161 kBq Final size of the sample is R = 22.3 kBq Time taken is t…

Q: Radon gas has a half-life of 3.83 days. If 2.70 g of radon gas is present at time t = 0, what mass…

A: Given: Half life, t1/2 = 3.83 days At t=0 mass of radon ,Co = 2.70 g   To determine mass of radon…

Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.