Engineering, 04.03.2021 20:30, dion27
Rods of radioactive waste that are highly active are stored in cooling ponds of purified water. Usually, the rods are stored 20 feet below the surface of the water. We wish to calculate the neutron flux that reaches the surface of the water. The total cross-section for an incident, room-temperature neutron onto a 1H nucleus is approximately 35 barns. The total cross-section for an incident, room-temperature neutron onto an oxygen nucleus is approximately 4 barns
A. Calculate the molecular number density of water.
B. Calculate the number density of hydrogen nuclei and the number density of oxygen nuclei.
C. Calculate the macroscopic cross-section (Z) for an incident, room temperature neutron passing through the water.
D. Calculate the mean free path ( (x) ) of a room temperature neutron in water.
E. Calculate the fraction of the radiation emitted from the rods that reach the surface of the water (1(x)/10).
Answers: 2
Engineering, 04.07.2019 18:10, siri5645
At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.
Answers: 1
Engineering, 04.07.2019 18:20, maustin5323
Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]
Answers: 1
Rods of radioactive waste that are highly active are stored in cooling ponds of purified water. Usua...