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The mass of a sample is 0.91 u. What is its mass in MeV/c2?
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- (a) What is the kinetic energy in MeV of a ray that is traveling at 0.998c? This gives some idea of how energetic a ray must be to travel at nearly the same speed as a ray. (b) What is the velocity of the ray relative to the ray?If the rest energies of a proton and a neutron (the two constituents of nuclei) are 938.3 and 939.6 MeV, what is the difference in their mass in kilograms?The electrical power output of a large nuclear reactor facility is 900 MW. It has a 35.0% efficiency in converting nuclear power to electrical. (a) What is the thermal nuclear power output in megawatts? (b) How many 235U nuclei fission each second, assuming the average fission produces 200 MeV? (c) What mass of 235U is fissioned in one year of fullpower operation?
- A chain of nuclear reactions in the Suns core converts four protons into a helium nucleus. (a) What is the mass difference between four protons and a helium nucleus? (b) How much energy in MeV is released during the conversion of four protons into a helium nucleus?Suppose you are designing a proton decay experiment and you can detect 50 percent of the proton decays in a tank of water. (a) How many kilograms of water would you need to see one decay per month, assuming a lifetime of 1031 y? (b) How many cubic meters of water is this? (c) If the actual lifetime is 1033 y, how long would you have to wait on an average to see a single proton decay?When U-232 undergoes alpha decay to Th-228, a mass lost is sustained. 1. Find the mass defect for this process in amu and kg. 2. The mass lost during the decay is converted to kinetic energy. Use Einstein equation to calculate the kinetic energy in joules and in Mega- electron volts (MeV). The exact mass of U-232 is 232.0372 amu. The exact mass of Th-228 is 228.0287 amu. The exact mass of He is 4.0026 amu. 1 amu= 1.6606 x 10-27 kg. 1 MeV = 1.602 x 10-13 J. 232 92 U -----> 228 90 Th + 4 2 He i have a attached a photo of the question.
- A sample of 23/892U is decaying at a rate of 4.00×10^2 decays/s . What is the mass of the sample?A group of geochemists have been analyzing a sample of radioactive material. After plotting ln(a) versus t, they calculate a slope value of -0.78·10−9 s−1. Determine the half-life of this material in years.One of the nuclear fission reaction that can happen in a nuclear reactor is the fission of Uranium-235 into Rubidium- 96 and Cesium-137 as shown below. The atomic mass of U-235 is 235.043930 u, the atomic mass of Rubidium is 95.93427 u, the atomic mass of Cesium-137 is 136.90709 u, and the mass of a neutron is 1.008665 u. Determine the amount of energy released by the reaction, expressed in MeV. Keep five significant digits.
- The energy released by each fission within the core of a nuclear reactor is 2.00 x 102 MeV. The number of fissions occurring each second is 2.90 x 1010, Determine the power (in watts) that the reactor generates. Number Units= 17. Oxygen-19 is unstable and undergoes - decay. Anna has a sample of 1.000 x 10¹0 Oxygen-19 atoms at time t = 0. One minute later, at t 60.00 s, there are 2.078 x 10⁹ Oxygen-19 atoms in her sample. What is the half-life of Oxygen-19, and how many decays per second will Anna measure at t = 90.00 s?The atomic mass of a helium atom is 4.0026 u. Convert this mass to units of kilograms and MeV/c2. HINT (a) kilograms kg (b) MeV/c2 MeV/c2
