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A sphere
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∙ 14y ago
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The most effective shape for achieving critical mass is a?
sphere
Critical mass depends on what?
The Purity && The Shape AND size density
What is the minimum mass of a fissionable isotope in which a nuclear chain reaction can occur?
A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (e.g. the nuclear fission cross-section), its density, its shape, its enrichment, its temperature and its surroundings.The minimum mass for a particular fissionable isotope will always be a sphere, as that is the shape which will lose the least neutrons for a given mass. The behavior of a sphere can be affected by its surroundings, if a neutron reflector is present this will reduce the amount needed. The easiest way to compare materials is to consider a bare sphere with no reflector. In this case Uranium 235 requires a mass of 52 kg and a sphere of diameter 17 cm. Plutonium 239 requires a mass of 10 kg and a sphere 9.9 cm diameter.The Wikipedia article 'Critical Mass' gives a table of other isotopes, but the above two are of most practical interest
What is the difference between rest mass and effective mass of electron?
mass
What is caused when critical mass is reached?
a chain reaction
The most effective shape for achieving critical mass is a?
sphere
Critical mass depends on what?
The Purity && The Shape AND size density
What is upper sub-critical limit for U235 mass?
The critical mass depends on the shape; I don't think there is an upper limit to that.For the case of a sphere, the critical mass for U-235 is 52 kg. The corresponding diameter of the sphere is 17 cm.
What is the most effective way for organized groups to shape public?
using the mass media
What is the most effective way for organized groups to shape public opinions?
using the mass media
What is the amount of fissionable material required to continue a reaction at a constant rate?
At less than critical mass, there are fewer "targets" for neutrons to strike, fission, and release more neutrons. As a result, the reaction dies out.
When was Critical Mass - Catholic rock - created?
Critical Mass - Catholic rock - was created in 1996.
When was Critical Mass - Threshold album - created?
Critical Mass - Threshold album - was created on 2002-09-02.
Is it true holes have a mass?
The electrons that are missing have a negative effective mass. So the holes have a positive effective mass.
What is the minimum mass of a fissionable isotope in which a nuclear chain reaction can occur?
A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (e.g. the nuclear fission cross-section), its density, its shape, its enrichment, its temperature and its surroundings.The minimum mass for a particular fissionable isotope will always be a sphere, as that is the shape which will lose the least neutrons for a given mass. The behavior of a sphere can be affected by its surroundings, if a neutron reflector is present this will reduce the amount needed. The easiest way to compare materials is to consider a bare sphere with no reflector. In this case Uranium 235 requires a mass of 52 kg and a sphere of diameter 17 cm. Plutonium 239 requires a mass of 10 kg and a sphere 9.9 cm diameter.The Wikipedia article 'Critical Mass' gives a table of other isotopes, but the above two are of most practical interest
Do nuclear reactors have critical mass?
We know that critical mass can be achieved in a nuclear reactor. If it could not, we'd not be able to get a chain reaction and generate heat to generate power. Reactors don't have critical mass when the control rods are in, but pull the rods, start the reactor up and away you go!
What is critical mass according to wolverine?
kingpen
