What is the value of nuclear density in F³/ u
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- Uranium-235 (235U) undergoes a series of alpha and beta decays in this succession: a, 2B, 5a, 2B, and a. Write the decay series and identify the daughter nuclide in each decay. 9.A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity of 1.60×1011 Bq A) How many radioactive nuclei are initially present in the sample? B) How many are present after 72.0 min? C) What is the activity after 72.0 min? Express your answer in becquerel. D) How many are present after 144 min? E) What is the activity after 144 min? Express your answer in becquerel.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 neutrons
- Nitrogen-13 undergoes beta plus decay. Determine the daughter nucleus and compare the binding energy per nucleon before the decay to after the decay. Which value should be higher?Complete each of the following nuclear reaction equations: (a)23592U + 10 n ---> 14156Ba + _____ (formula) + 3 10n (b)23892U ---> 23490Th + ________ ( formula and name) (c)3015P ---> 3014Si + _______ (formula and name) (d) 22888Ra ---> 22889Ac + ______ (formula and name)Suppose a cube has a mass of 1.4 kg and the density of nuclear matter (which you can assume is 2.3 × 1017 kg/m3). Find the length of a side of such a cube in μm.
- A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial sample. a) What is the initial activity of this sample? Bq b) How many days does it take for this sample to decay to 3.09e+14 nuclides? daysThe half-life of this nucleus is 1.0 seconds. For the following times fill in the rest of the chart and predict the number of parent nuclei left and the number of new daughter nuclei produced. Time (seconds) Number of half-lives Parent Nuclei Daughter nuclei 0.0 Start 100 0 1.0 1 50 50 2.0 2 25 75 3.0 3 12 4.0 4 5.0 5 6.0 6 7.0 7 8.0 8 9.0 9 10 10b) Complete the following decay reaction by identifying both the temporary nucleus (??) and the end product (?) that it decays into. In this case, sodium-23 is bombarded with protons, forming a short-lived nucleus which quickly undergoes alpha decay. 2Na+H → (??) → (⁄?) + ª Enter the chemical symbol for the temporary nucleus: Enter the mass number for the end product, A = Enter the atomic number for the end product, Z = Enter the chemical symbol for the end product: AV A/ AV 10
- After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to 82.2% of the initial activity. What is the half-life of this material? days Need Help? Read ItA 56-kg sphere of U-235 constitutes a critical mass. If the sphere were flattened into a pancake shape, would it still be critical? Explain.After 1.80 days, the activity of a sample of an unknown type radioactive material has decreased to 80.4% of the initial activity. What is the half-life of this material?