A sample of a radioactive substance contains 200 undecayed atoms. How many will remain undecayed after 3 half-lives?
Q: 1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms…
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A: Given data The initial mass of the radioactive substance is: Xo = 100 kg The mass of the radioactive…
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Q: How many half-lives would it take for 6.02×10 ^23 nuclei to decay to 6.25%(0.376×10^23) of the…
A: Initial no. Of nuclei( No) =6.02×1023 Final no. Of nuclei(N)=0.376×1023 ;(6.25% of initial no. Of…
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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: dq = A dx dx E P
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Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…
A: Let original number of atoms = NoLet the number of atoms present after time "t" = N
Q: An 1 g sample of a radioactive element takes 83.92 million years to reduce into 1 µg. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
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
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Q: 26 amu. what is its binding energy per nucleon? (6) For the nuclear reaction 14 4. 17 He H.…
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Q: The stable isotope of sodium is 23Na. (a) Find the total binding energy and the binding energy per…
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Q: Two radioactive nuclides, A and B, are presented at t = 0 with the number of nuclei of A equal twice…
A: At , t = 0 , the number of A nuclei is twice the no of B nuclei. Na(0) = 2× Nb(0) The lifetime of…
Q: radioactive sample initially undergoes 12.0×10^4 decays/s. Twenty-four hours later, its activity is…
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Q: An 10 g sample of a radioactive element takes 5432.6 years to reduce into 1 g. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: You have an istope with a decay constant of 2.48x10-³s-¹. What is the half life of isotope?
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Q: 1. The decay of radioactive substance is given by -t T N = Nᵒe (1), where N is the number of atoms…
A: You are using incorrect symbol for Tau (decay constant).
Q: Nucleus A decays into the stable nucleus B with a half-life of 10 s. At t = 0 s there are 1000 A…
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Q: Some nucleus of ¹9X (atomic mass = 189.96182 u) undergoes - decay to become ¹2X1 (atomic mass =…
A: The mass of the parent nucleus is 189.96182 u. The mass of the daughter nucleus is 189.95844 u.…
Q: Tritium has a half-life (half-life) of 12.33 years. In a sample of tritium, what percentage of 3H…
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- Plutonium-238 (238Pu) is a radioactive isotope with a half-life of 87.7 years. If a sample of 238Pu currently has an activity of 7000 decays/s, what was the activity 438.5 years (5 half-lives) ago?(a) 1.12×105 decays/s(b) 4.48×105 decays/s(c) 2.24×105 decays/s(d) 2.19×102 decays/s(e) 3.50×104 decays/sThe half-life of a radioactive isotope is known to be exactly 1 h. a) What fraction of a sample would be left after exactly 3 h? % Remaining = b) What fraction of a sample would be left after exactly 1 day? % Remaining =1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms present at time t, No is the initial number of atoms and T is the exponential decay constant, which is related to the decay rate of the element. The N 1 half-life thalf is the time required for the number to atoms to decay by half ( = No 2 Solve for thalf starting from equation (1) in terms of T. Note: Use MathType to enter in T. Do not use the letter "T" from the keyboard. Don't forget the multiplication sign between variables. Use the asterisk symbol (*) for multiplication or the multiplication symbol in the math editor (orange box). thalf = 0.693 X√ S No, that's not the correct answer.
- A radioactive sample is prepared; 10.78 hours later, only 1/16th of the original sample remains. What is the half-life of this radioactive sample in hours? Round to one decimal place.A 10 g sample of a radioactive element took 12 days to reduce into 1 g. Calculate the half-life and identify the element.(2) What is the mass defect of a He atom if the atomic mass is 4.002603 amu? Answer: --- mass defect 0.030377 amu Am = (3) What mass of fuel must be consumed in a nuclear reactor to produce 36 x 10 Joules? (4) If 5 kg of fuel is consumed in a nuclear reactor how much energy is released?
- An unknown isotope has an atomic number, Z 15 and atomic mass number, A = 32. It decays via beta decay and emits an electron and antineutrino. %3D How many protons and neutrons are in the resulting daughter nuclide? o 16 protons 16 neutrons o 15 protons 17 neutrons o 13 protons 15 neutrons o 14 protons 17 neutrons o 14 protons 18 neutronsA 5 g sample of a radioactive element takes 102 days to reduce into 3 g. Calculate the half-life and identify the element.Half life of a radioactive isotope is 4x10³ years. If there are 10³ radioactive nudei in a sample today, the number of such nuclei in the sample 4x10⁹ year ago were: (A)128 X10³ (B) 256X10³ (C) 512 X10³ (D) 1024 X10³
- A sample of hypothetical element X decays by positron emission and has a half-life of 79 years. How many years are necessary for a sample of this radioisotope to be reduced by 79%? Answer to the nearest year.The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may be described by an exponential decay N(t) = N0exp(-t/τ) where τ is the decay time. What is the decay time τ if the half-life t1/2 = 3hrs? Select one: a. 8.15 hours b. 3 hours. c. 90 mins. d. 260 mins.A 10 g sample of a radioactive element takes 16.21 mins to reduce into 6 g. Calculate the half-life and identify the element.