Lex Luthor has found a piece of 239 94 Pu (which he’s going to make into a bomb so he can hold Metropolis hostage). This piece of plutonium was made by a prehistoric civilization. Originally it was 40/kg, but now it contains 10/kg of Pu. How old is the piece?

Q: A radioactive material produces 3.522E+3 decays per minute at one time, and 5.47 h later produces…

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Q: Randon gas has an atomic number 86 and mass number 222. Randon is radioactive and decays via…

A: Alpha decay is a nuclear decay process where an unstable nucleus changes to another element by…

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: What mass of thallium-201 is needed to have an activity of 10 mCi? How long will it take for the…

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Q: For the fission reaction shown below, find the energy (in MeV) that is released. in + 920 1 235 136…

A: Given : Fission Reaction : n01+U92235→S3888r+X54136e+12n01

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: You have a 5.2 mol pure sample of an unknown material. After 1.2 h, you discover that 56% has…

A: Given that                    The initial number of the moles of the sample is No = 5.2mol Since…

Q: The uranium in the earth’s crust is 0.7% 235U and 99.3% 238U. Two billion years ago, 235U comprised…

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Q: Natural uranium is 0.7200% 235U and 99.27% 238U . What were the percentages of 235U and 238U in…

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Q: In this nuclear reaction F + il the atomic mass of H is 1.007825 u, the atomic mass of 0 is…

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Q: What is the energy associated with the formation of 4.15 g of 4He by the fusion of 3H and H?…

A: 1H + 3H => 4 He + heat  Change in mass ( mass converted to energy ) = (( 1.00783 + 3.01605 ) -…

Q: By READING the R vs t graph shown below, determine R, & the half-life. R (x10¹2 decays/h) 80 60. Ro…

A: Given From the given graph of Decay rate vs time  R0 is the rate of decay at t =0 Therefore ,   R 0…

Q: What is the energy released in this β−β−nuclear reaction 20380Hg→20381Ti+0−1e80203Hg→81203Ti+−10e?…

A: The expression for the nuclear reaction is,

Q: Radioactive isotopes used in cancer therapy have an "expiration date." For example, a widely used…

A: initial activity = 5000 Ci activity which is considered to be too weak for treatment = 3500 Ci Half…

Q: the decay constant or the beta decay of ^99 43Tc was found to be equal to 1.0x10-13/s. What is the…

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Q: released

A: Nuclear fission is a process in which a large nucleus splits into smaller nuclei and it is used to…

Q: The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the…

A: According to the radioactive decay law,

Q: 238 10. 22U has a mass of 238.050783 u while containing 92 protons and 146 neutrons. What is the 238…

A: Given,  Mass of Uranium 238, MU=238.050783u Number of protons, nP=92 The number of neutrons, nN=146…

Q: Natural uranium is 0.7200% 235U and 99.27% 238U . What were the percentages of 235U and 238U in…

A: Given data: Percentage of U235 is, 0.7200% . Percentage of U238 is, 99.27% . Time for formation of…

Q: Fill in the missing isotope for the following decay process. C→ ?+e¯+v A 14N B He © c' 1Be

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Q: А) Теmрerature D) Electric & B) Pressure y9 The half life of radium is about 1600 years. If 100…

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Q: How many neutrons are emitted when a uranium-238 nucleus (Z = 92) is bombarded with a deuteron…

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Q: The thermal reproduction factor for 3.5% enriched uranium fuel is: [Data: V235 = 2.42; oa 235 = 684…

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Q: A piece of radium has an activity of 92 mCi. (a) What is the mass of the radium?

A: Given: The activity of the radium is 92 mCi. The molecular mass of the radium is 226.

Q: On absorption of a single neutron, plutonium Pu-239 can undergo fission into xenon Xe-134 plus…

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Q: 10] (a) Is the reaction shown below a fission reaction or a fusion reaction? (b) Find the energy =…

A: given : (m;He =3.016 029u,   m,D = 2.014102u , make = 4.002 603u , m.H = 1.007 825u and  1 u…

Q: The most common isotope of uranium 2U has a half-life of 4.47 x 10 years, decaying to 92 234 Th by a…

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Q: How many calendar years (= exactly 365 days) can a 5.75 W LED lamp light up with 0.853 kg deuterium…

A: Given The amount of deuterium m = 0.853 kg Energy from one deuterium E = 0.823 MeV Power of the LED…

Q: 36 O What is the Q of the following fusion process? ?Hị + 'Hị -Hez + photon Here are some atomic…

A: The formula for the mass-energy equivalence relation is: The energy released in the process is…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.90 billion years old by…

A: Given, Half-life of U238 is 4.47 ×109 years

Q: How much energy (in MeV) is released in the following nuclear reaction? 'n+ U → Ba+ Kr +3,n 92 56…

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Q: Now consider the following nuclear reaction: 239 Pu + He 1 242 Cm + 6 96 94

A: Given that: P94239u+H24e→C96242m+n01 M(P94239u)=239.5022 uM(H24e)=4.00260 uM(C96242m)=242.0588…

Q: All the very heavy atoms found in the earth were created long ago by nuclear fusion reactions in a…

A: Given values: Half life of U235,  t12(U235)=7.04×108 yr Half life of U238,  t12(U238)=4.47×109 yr…

Q: How many years can a 7.93 W LED lamp light up with 0.735 kg deuterium if 23.41% of the released…

A: Energy released in fusion reaction of two deuterium nuclei = U= 3.27×106 eV Energy converted into…

Q: The ceramic glaze on a red-orange Fiestaware plate is U2O3 and contains 50.0 grams of 238U , but…

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Q: Deuterium fuses with tritium by the following reaction: 21H+31H⟶42He+10n12H+13H⟶24He+01n The…

A: Given that: H12+H13=H24e+n01m(H12)=2.014102um(H13)=3.016049uKnown values:m(H24e)=4.002602…

Q: Find the energy (in MeV) released in the fission reaction shown below. n + 23592U → 9840Zr + 13552Te…

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Q: 46. Old stars obtain part of their energy by the fusion of three alpha particles to form a 1?C…

A: Given, the fact that three alpha particles fuse to form a carbon nucleus. We know,  m(4He2) =…

Q: A.) Natural potassium contains 40K, which has a half-life of 1.277 ✕ 109 y. What mass of 40K in a…

A: Decay Rate: The independent variable that is determined by taking the reciprocal of mean of 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: Calculate the energy released in the following nuclear fission reaction:…

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Q: What are the advantages of Plutonium-239 over 235U as a reactor fuel?

A: The splitting of  radioactive heavy nucleus in to two small daughter nuclei by bombardment of a…

Q: How many years can a 7.93 W LED lamp light up with 0.735 kg deuterium if 23.41% of the released…

A: Given : Energy of LED = 7.93 W Amount of deuterium, m = 0.735 kg = 735 g

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.