U-235 has a decay constant of 3.138 × 10¹7 s¹. Calculate the ratio of U-235 remaining after 500 million years.
Q: Plutonium-239 has a half life of 24100 yr. Starting with a sample of pure 239 Pu, how long would it…
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Q: radioactive
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Q: The graph below shows the decay of a sample of 14C that initially contained No atoms. Decay Plot No…
A: Half-life is the time taken to disintegrate half of the initial concentration.
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A: Given Data: Half life = T = 68.9 years = 68.9 years×365 days1 year×24 hrs1 day×60 min1 hr×60 sec1…
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A: Given, The half-life of an isotope, t12 = 9.82 hr
Q: Radon-222 has a half-life of 3.8 days. What mass of radon-222 would have a decay rate of 2220 Bq?…
A: We use the formula of rate of decay to get the required values.
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A: According to the radioactive decay law,
Q: Consider the following nuclear reaction. 232 /92U→228/90Th +X (A) What is the product X? (B)What is…
A: For the given reaction
Q: A particular radioactive sample undergoes 2.50××10^6 decays/s. a) What is the activity of the…
A: In the given question , We have to determine the values of given parts.
Q: 75% of a quantity of U-232 remains after 30 years. What is the half-life?
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Q: How much energy is released in the following fission process? 23592U + n→ 14156Ba +⁹236Kr+ 3n The…
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Q: (a) Is the following reaction a fission reaction or a fusion reaction? He + D→ 'He + 'H (b) Find the…
A: (a) Two lighter nuclei fuse to form a heavier nucleus. Thus, the given reaction corresponds to a…
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A: Solution: Given that half-life of the sample, t1/2 = 8.04 days = 694656 s. Time for decay, t = 5week…
Q: The equation of a fission process is given in which 235 U is struck by a neutron and undergoes…
A: Let n denotes the neutron, mn denotes the mass of a neutron, mU denotes the mass of the uranium, mBa…
Q: A certain isotope has a half-life of 9.06 h. What is its decay constant in s-1?
A: Given: The half life time is 9.06 h.
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Q: Tritium is naturally rare, but can be produced by the reaction n + 2H → 3H + γ. How much energy in…
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Q: radioactive
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Q: Problem 9: 235U is the rarer of the two most common uranium isotopes. Most uranium is 238U.…
A: a)
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A: The radioactive dating of rocks formed from cooled lava is determined by using parallel decay of…
Q: Natural Uranium, as found on earth, consists of two isotopes in the ratio of ^ 235 U/ ^ 238 U=0.07…
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- When there are too many or too less neutrons inside a nucleus it becomes unstable. They become stable by removing protons or neutrons through radiation. This process is called radioactive decay.
- This radioactive decay of an unstable nucleus is exponential in nature. It is given by,
Here N0 is the original number of radioactive nuclei present, λ is the decay constant, and t is the time.
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- Calculate the energy released in the a decay of 238 U. The atomic masses of 238 U, 234Th and He are 238.050784 u, 234.043593 u and 4.002602 u respectively.A radioactive material has a decay constant of λ = 0.0586 yr-1. If it starts out with N0 = 9.03 × 1018 particles, how many (N) will be left after t = 407 years have gone by? Express your answer in scientific notation. (Example: 1.23e4)A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much 206 Pb should it contain? Assume 238U decays directly to 206PB with a half-life of 4.47 × 109 y.
- Calculate the energy (in MeV) released in the αlpha decay of U-238. Answer in 3 decimal places.Carbon-14 is naturally rare, but can be produced by the reaction n + 14N → 14C + p. How much energy in MeV is released in this neutron capture? (Assume 1 u = 931.5 MeV/c2.)A.) Natural potassium contains 40K, which has a half-life of 1.277 ✕ 109 y. What mass of 40K in a person would have a decay rate of 4140 Bq?=____g B.) What is the fraction of 40K in natural potassium, given the person has 140 g in his body?
- help pleasePotassium-argon dating is used to measure the age of rocks formed from cooled lava by determining the fraction of the original 40K remaining in a sample from the ratio of 40K:40Ar. Unusually, potassium-40 decays into both 40Ca (89.1% of the time) and 40Ar (10.9% of the time) with a half-life of 1:248 x 10^9 years.1. What is the calculated age of a sample in which the faction of 40K remaining was found to be 0.0043?2. Is this result physically plausible?Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining the fraction of the original 40K remaining in a sample from the ratio of 40K:40Ar. Unusually, potassium-40 decays into both 40Ca (89.1% of the time) and 40Ar (10.9% of the time) with a half-life of 1:248 x 10^9 years. 1. Write out balanced nuclear equations for these two decay processes. 2. Calculate the specific activity of 40K.
- Radioactive potassium-40 has a half-life of 4.2 x 1016 s. a) Calculate the decay constant of potassium-40. b) A sample of potassium-40 has an initial mass of 1.0 g. Calculate the number of parent nuclei present in the sample, as well as the initial activity of the source. (One mole of potassium-40 has a mass of 40 g and NA = 6.0 x 1023 mol-1) c) Calculate the number of parent nuclei present in the sample after 9.2 x 1016 s.Calculate the energy released in the following nuclear fission reaction: 239Pu+n→98Tc+138Sb+4n239Pu+n→98Tc+138Sb+4n Recall that the atomic masses are 239 Pu239 Pu = 239.052157 u u, 98 Tc 98Tc = 97.907215 uu, 138 Sb 138Sb = 137.940793uA freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 4.00 h, its activity is 8.00 mCi. Find (a) the decay constant and (b) the half-life.