What fraction of a radioactive sample remains after (a) one, (b) two, and (c) three half-lives have elapsed?

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: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h1 (a) Calculate the…

A: Given(s): Decay constant, λ=0.0256 h-1 Require: Half-life, t12=? Fraction of sample left after,…

Q: A sample of the isotope 131I, which has a half-life of 8.04 days, has an activity of 5.0 mCi at the…

A: Given: The half-life of the sample =8.04 days The activity of the sample = 5.0 mCi The activity of…

Q: In a piece of rock from the Moon, the 87Rb content is assayed to be 1.82 x 1010 atoms per gram of…

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Q: Astatine-211 undergoes gamma decay. Given the changes, if any, in the nucleus produced by this type…

A: In gamma decay energy is released in the form of photons but number of protons and neutrons remain…

Q: The activity of a radioactive isotope is 16000 disintegrations/sec. The activity drops to…

A:

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: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h. (a) Calculate the…

A: We have, disintegration constant, λ=0.0256 h-1 we have to find the half-life, a fraction of the…

Q: A radioactive source consists of 6.4 x 10^11 atoms of a nuclide of a half-life of 2 days. A second…

A: According to question we need to find--- After how many days will the number of radioactive atoms…

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: What is the daughter nucleus (nuclide) produced when 217At undergoes alpha decay?

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Q: If you make an account of 1000 people born in the year 2000 and find that half of them are still…

A: An account of 1000 people are made in 2000 and half of them are still alive in 2060. But this does…

Q: 1. A radioactive substance has a half-life period of 60 days What is the disintegration constant?…

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Q: What is a radioactive tracer?

A: Radiactive tracer: The tracer is used to detect the radioactive particle in any kind of mechanism.…

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: If two grams of a radioactive isotope has a half - life of twenty hours, the half life of one gram…

A: half life of two grams of a radioactive isotope = 20 hours

Q: The activity of a radioisotope drops to 1/32 of its original value in 25 minutes. The decay constant…

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

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Q: If you start out with 20 grams of a radioactive material, and 4 hours later you have 5 grams of that…

A: Given data:  Initial amount of material (N0) = 20 g Time (t) = 4 hours Remaining amount of material…

Q: 5.1 A sample of the isotope 1311, with a half-life of 8.04 days, has an activity of 10 mCi at the…

A: Given , half-life of I131 = 8.04 days Activity = 10mCi Upon receipt of I131 in medical laboratory ,…

Q: The activity of a radioactive sample decreases exponentially as the time goes on.

A: Radioactivity of a sample is given as, Where A0 is the initial activity, lambda is the 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: To date the age of the oldest materi als, scientists would normally tum to the radioactivity of a.…

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Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

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Q: If a sample of a radioactive isotope has a half-life of 1 year, how much of the original sample will…

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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 sample of radioisotope has a decay constant of 9.976✕10-7 s-1 and prepared with an initial…

A: Given data: The decay constant of a sample of a radioisotope is, The initial activity of a sample…

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

A: Given data,

Q: what is the specific difference between radioactivity and radioactive decay?

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Q: If a 1.50-cm-thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

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

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Q: A certain radioisotope has a half-life of 8.96 days. What percentage of an initial sample of this…

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Q: The half-life of 23U is 4.5 x 10° yr. A sample of rock of mass 1.6 g produces 29 dis/s. Assuming all…

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Q: The graph represents the activity of a sample with respect to time of a radioactive nuclide.…

A: The activity (A) of a radioactive sample is defined as the number of disintegrations per second. The…

Q: The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of…

A: Formula of radioactivity is as follows: I=I0e-λt…

Q: The activity of a particular radioactive nuclide falls from 1 × 10! Bq to 2 x 1010 Bq in 10 hours.…

A: Activity of a particular radioactive nuclide falls from, A0 = 1×1011 BqAt =2×1010 Bqat, t = 10 hours

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

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Q: Americium-241 is used in smoke detectors. It has a first-order rate constant for radioactive decay…

A: The radioactive decay relation with the decay constant and radioactive sample quantity is given as…

Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

A: Given, The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10…

Q: which radioactive decay mode does no result in a different nuclide?

A: Majorly there are 3 types of nuclear decays: Alpha decay: In this decay an alpha particle which has…

Q: A radioactive sample contains 3.2. atoms of a particular nuclide and emits 3600 a- particles per…

A: Given:Radioactive sample,α=3.2×1018 atomsRate=3600 perticle/secondFind the decay constant,k of the…

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.