Ql: A radioactive material produces 1280 decays per minute at one time, and 4.6 h later produces 320 decays per minute. What is its half-life?

Q: Radioactive nuclide, 90Sr, has a half-life of 30 years. What percent of a sample of 90Sr will|…

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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: If a 6.13 g sample of an isotope having a mass number of 124 decays at a rate of 0.350 Ci, what is…

A: The mass of the sample, m=6.13 g   The mass number, A=124 u   The rate of decay, dNdt=0.350…

Q: The activity of a freshly prepared radioactive sample with a half-life of 4 days is 1000 Bq. How…

A: Given : t1/2 = 4 days No = 1000 Bq N = 250 Bq

Q: 4.0X1018 atoms decay with a half-life of 2.3 years, how many are remaining after 3.7 years? Type the…

A: Given data: The initial number of atoms at time t=0, N0=4.0×1018. The half life of the atoms,…

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: The half-life of radium-226 is 1600 years. Suppose we have a 55 mg sample. Find a function that…

A: Write the expression for the radioactive decay model for the function that models the mass m(t)…

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: If a 3.16-g sample of an isotope having a mass number of 135 decays at a rate of 0.530 Ci, what is…

A: Given Mass of Isotope = 3.16 gram = 3.16×10-3 Kg Mass Number = 135  Rate of decay = 0.530 Ci As…

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

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Q: A radioactive sample has a mass of 999 grams. How much remains after 2 half-lives?

A: If the amount of a radioactive sample is N0 initially, then after 1st half live of the sample, it…

Q: The half-life of Erbium-172 is 49.3 hours. What is the hourly decay rate? Express the result to four…

A: Given data The half-life of erbium 172 is given as t = 49.3 hours.   Now, the hourly decay rate is…

Q: Cobalt-60 has a half-life of 5.24 years.(a) Find the mass that remains from a 100-mg sample after20…

A: t=Duration of half life=5.24 yearsk=ConstantC=Mass of Cobalt=100 mg

Q: An artifact classified as charcoal, found in a site at Epirus, Greece, is found to have a 14C…

A: initial radioactivity(Ro)=0.255 counts per second final radioactivity(R)=4.36 X 10-2 counts per…

Q: Suppose we have a sample containing 1.91 mCl of radioactive 131 (t,2 - 8.04 d). (a) How many decays…

A: Solution: Given that half-life of the sample, t1/2 = 8.04 days = 694656 s. Time for decay, t = 5week…

Q: To date the age of the oldest materi als, scientists would normally tum to the radioactivity of a.…

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Q: Uranium has a half-life of 4.47 billion years! How long does it take for a sample of 100 grams to…

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Q: If 16 g of radon with a half-life of 4 days is present in a balloon at t = 0, what is the mass of…

A: Most of the nuclei present are unstable in nature. They try to gain stability by disintegrating…

Q: What is rate of decay after 2.5 seconds?

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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: 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: The half-life of Uranium-237 is 5.83 x 105 If you have a sample with 5.89 x 1024 atoms in it, how…

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Q: A 40 grams in radionuclide decays 35 grams in 240 years. What is the half-life of the radionuclide?

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Q: A radioactive material produces 1280 decays per minute at one time, and 4.6h later produces 320…

A:

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

A: *According to question:-Decay Rate of Isotope initially=Ro& Decay Rate after one-half…

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: Given that radioactive cobalt-60 has a radioactive constant equal to 3.8 x 10° s determine its…

A: Given information: Here, λ is the radioactive constant or decay constant.

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: If the atomic mass of Sodium-18 is 18.02597 u, what is the binding energy?

A: Please note : As per answering guideliens I can answer the first question only. Since,,this is not a…

Q: How much mass of a decaying 1kg sample with a half-life of 3hours will be left after 1 day has…

A: Given - Initial mass of the sample Mo= 1 kg  Half life of the sample T1/2 =3 hours Time period for…

Q: How many radioactive nuclides are in a sample with a radioactivity of 3.1 kCi? The half-life of the…

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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: 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: Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally…

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Q: The radioactive isotopes of lead PB 209,decays at a rate proportional to the amount present at time…

A: Radioactivity N=N0e-0.693tT1/2t=-T1/20.693lnNN0

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 half-life, which is unique to any given isotope, is defined as:

A: We know  half life :-The time taken for half of the original population of radioactive atoms to…

Q: A radioactive isotope of silver has half-life of 20 minutes. What fraction of the original mass…

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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…