The initial activity of a radioactive source is 600 counts per second. After a time T, its activity becomes 75 counts per second. If the half life of the source is 16 hours, what is T? * 16 hours 32 hours 40 hours 48 hours

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

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Q: After how many half-lives will (a) 10.0%, (b) 5.00%, and (c) 1.00% of a radioactive sample remain?

A: Formula to calculate the number of half-lives is,

Q: Half-life of radioactive element 13153I is 8.0252 days. (A) Its decay constant, λ (B) Percentage…

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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: What is a radioactive tracer?

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

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: 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: QI: A hospital technician is working with a radioactive source. The graph below shows the activity…

A: The given graph is shown below

Q: The steps below show three of the steps in the radioactive decay chain for 232 90Th. The half-life…

A: Given: The steps below show three of the steps in the radioactive decay chain for 232 90Th. The…

Q: 1 Nuclear Radius The density of nuclear matter can be estimated by assuming A spherical nucleons of…

A: As radius is given as r=r0A13, where r0 is a constant equal to1.2×10-15 m and A is number pf…

Q: The half-life of the radioactive nucleus 226 88Ra is 1.6 ᵡ 103 yr. If a sample initially contains…

A: The expression for the decay constant(λ) is given as, λ = ln 2t1/2, where t1/2 is the half-life…

Q: Three quarters of nuclie in a given radioactive sample decays in 2 weeks. What is the half life of…

A: we have to find half life of the sample, in the given question.

Q: The activity of a sample of a radioisotope at some time is 10.5 mCi and 0.46 h later it is 7.00 mCi.…

A: Initial activity of isotope is Ro = 10.5 mCi Activity after some time is R = 7.00 mCi Time elapsed…

Q: A radioactive sample is monitored with a radiation detector which registers 11360 counts per minute.…

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Q: The radioactive isotope 31Si has a half-life of 2.62 h. A sample containing this isotope has an…

A: decay constant (d) = 0.693/half life d = 0.693/2.62 hr -1 d = 0.2645 hr-1 d = 0.00007347328 sec-1…

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

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Q: Find the missing value for the radioactive isotope. (Round your answer to two decimal places.)…

A: we know that  decay constant λ =ln2half lifeand m=m0e-λt

Q: The carbon–14 activity in papyrus growing along the Nile River today is 231 decay events per…

A: Name of element Carbon 14 Decay events per kilogram of papyrus = 231 Decay events per kilogram of…

Q: Given the mass of a radioactive material, phosphorus 32P is 0.60 g and its half-life, T1/2 is 14.3…

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Q: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A: Radioactivity is the process of decay of heavy nuclei due to an unstable nuclei or due to a…

Q: When radioactive 38Sr90 emits a negative beta particle, the isotope that is formed is: A.…

A: Given data:  The Radioactive substance  S3890r Type of decay: Negative beta decay Required: Nucleus…

Q: Given a half-life of a radioactive source is 435 years. Calculate the time taken for its activity to…

A: Half life of a radioactive substance is given. We are Required to calculate the time it takes for…

Q: An unstable nucleus undergoes alpha decay with the release of 5.52 MeV of energy. The combined mass…

A: Given    Let the parent nuclei be A daugther nuclei be B The nuclear reaction is given as  A = B +…

Q: The unstable 234Th isotope decays by beta emission with a half-life of 24.5 days. If the initial…

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Q: A freshly prepared sample of a certain radioactive isotope has an activity of 10.2 mCi. After 3.70…

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Q: . The activity of a radioactive sample decreases by 93.75 % in 2.5 years. What is the half-life of…

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Q: A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity…

A: Given Data: The half-life of a radioactive isotope is, t1/2=72.0 min The initial activity is,…

Q: A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the…

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Q: The radioactive isotope 198Au has a half-life of 64.8 h. A sample containing this isotope has an…

A: Given data: The half -life of A198u is T1/2 =64.8 h The initial activity of the sample ,A =40 μCi…

Q: The radioactive nuclide 199Pt has a half-life of 30.8 minutes. A sample is prepared that has an…

A: Scenario - Radioactive sample decays to get reduced in quantity. Given: P199t Half Life→Thalf=30.8…

Q: A patient is injected with a radioactive isotope with a radiological half life of 12 days. The…

A: Option: A

Q: The radioactive isotope Pt-188 decays into a stable nuclide after a series of 4 separate decays. The…

A: Eu63144  undergoes alpha, alpha, +beta,+beta decay...

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

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Q: The decay rate of a radioactive source decreases by 28% in 80 h. Determine the half-life, decay…

A: According to law of radioactive decay:N=N0e-λtN0=initial massN=mass at time tλ=decay…

Q: A 162.0-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample…

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Q: What fraction f1 of a radioactive sample will be left after 3 half‑lives? f1 = ? What fraction f2…

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

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Q: The half-life of 23$U, an alpha emitter, is 7.1 x 10° yr. Calculate the number of alpha particles…

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Q: 15. A nuclide (Z,A may transform into a nuclide (Z-1,A) by the emission of a. an alpha b. aB- a B+…

A: GivenA nuclide (Z,A) ma transform into a nuclide (Z-1,A)

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: 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: if the daughter nucleus in an a decay is 22488 Ra, what is the parent nucleus

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Q: A radioactive sample was measured 9.1 years ago. It had an activity of 9783.8 Bq. Today, its…

A: Given: The intial activity of the sample is 9783.8 Bq. The final activity of the sample is 21 Bq.…

Q: Iodine-131 is an important radioisotope of iodine that has a radioactive decay half-life and is…

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Q: What fraction f1 of a radioactive sample will be left after 6 half‑lives?   What fraction f2 of a…

A: To determine: 1) fraction f1 of a radioactive sample will be left after 6 half‑lives 2) fraction f2…

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.