Only 85% of the initial amount of a certain radioactive material following exponential decay remains after 60 minutes. Find the half-life of the material. Select the correct response: 4.71 hours 4.11 hours none of these 4.36 hours 4.68 hours 4.57 hours

Q: Choose the BEST answer to the following. The equation that most underlies energy release in nuclear…

A: The equation in option (a) gives the energy of a photon.

Q: A radioactive material requires short time to decay completely naturally.Is it true or false?

A: The phenomenon of continuous emission of radiation like alpha, beta, gamma, X-rays, etc. from a…

Q: If 100 grams of a radioactive substance is left to decay, how much would be left after 5 half-lives?…

A:

Q: Radon gas has a half-life of 3.83 days. If 2.86 g of radon gas is present at time t = 0, what mass…

A:

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: if you started with a parent isotope with 100% of its atoms and its half-life is 10 years. What is…

A: Given. t/T = 2 N(t) = No(1/2)t/T

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: 11.    The half-life of Uranium-237 is 5.83 x 105 seconds. What is the decay constant?

A:

Q: The half-life of carbon-14 is 5730 yrs. Find (a) its decay constant __________s-1 (b) the initial…

A:

Q: The half-life of radium-226 is 1590 years. Suppose we start with a sample of radium-226 whose mass…

A: Given: The half-life of radium = 1590 years Mass of the sample = 50 mg

Q: Calculate the mass of a sample of (initially pure) 40K that has an initial decay rate of 1.70 * 105…

A: The initial decay rate,

Q: Choose the BEST answer to the following. A radioactive sample has a half-life of 1 hour. Starting…

A: The number of half -life passed in a time is,

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: A radioactive nuclide that has an atomic number of 53 and a mass (nucleon) number of 131 is used to…

A:

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: A certain radioactive nuclide decays with a disintegration constant of 0.0137h1. (a) Calculate the…

A: Given  Disintegration constant λ=0.0137 h-1 (a)  half life T1/2 =0.693λ T1/2= 0.693/0.0137…

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

A: a)Fraction of material left after one half life is,

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: 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: Radioactive Substance Decay Rate, k 5.5% per year ==0.055 Half-Life 21. Tritium 0063

A: (21) Given data: The decay rate of tritium, k=0.055 year-1.   Express the relation for the half-life…

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

A: Ans (a) in this question half life of c-14 is given as 5230 years so    Thalf=5230y and we know the…

Q: A radioisotope has a half-life of 5.00min and an initial decay rate of 8000 Bq. (1.) What will be…

A:

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: Which describes radioactive decay of a substance?

A: Which describes radioactive decay of a substance.

Q: Q4: - The radioactive isotope 198Au has a half-life of 64.8 h. A sample containing this isotope has…

A:

Q: 13. After two half-lives, how much of the original sample would remain? 50% 6.25% 12.5% 25%

A:

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

A:

Q: The half-life of radium-226 is 1.6 x 10 years. How long will it take for 20.0 mg of radium-226 to…

A:

Q: Suppose that you are given a 200 gram sample of a radioactive substance with a half-life of 45 days.…

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Q: If 10% of a radioactive material decays in 5 days, then the amount of the original material left…

A:

Q: The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in…

A: Given that:- Half life of radon-222=2.8 days

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

A: Option: A

Q: The half-life of uranium–238 is 4.5 billion years. What is the decay constant for uranium–238?

A: Calculation: The half life time of the uranium238 is 4.5 billion years.

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

A:

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: Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio…

A: In this question we have to find the age of the rock in years. Please give positive feedback if the…

Q: The original number of atoms in a sample of a radioactive element is 4.00x10-0 . Find the time it…

A:

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

A:

Q: The isotope Carbon 14 decays by β emission and has a half-life of 5730 years. The carbon in living…

A: This question can easily be solved by applying the concept of radiocarbon dating .

Q: The half life of radium is 1.62x10^3years. What fraction of radium would remain after 1.0x10^3years?…

A:

Q: Californium-254 has a half-life of 60days. (a) A sample has a mass of 16 mg initially. Find a…

A: Half life of a radioactive substance is a constant quantity. It tells the time taken by a given…

Q: The initial activity of a radioactive source is 600 counts per second. After a time T, its activity…

A:

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…

Q: The half-life of a radionuclide is 26.4 years. The time required for a 48.0 gram sample of this…

A: Write the given values of the problem- Half life of a radio nuclide=26.4 years Mass of given…

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.