minimum amount
When the mass of the fissionable material is small, the chances of fission neutrons to cause further fission are small because they may escape without causing any fission. However , as the mass of fissionable material is increased, there are more atoms in the way of a fission neutron and hence the probability of further fission is increased. It follows that in order to cause explosive chain reaction , the mass of fissionable material must be equal to or more than the critical mass. Thus , this is the importance of critical mass in a chain reaction.
A chain reaction is any reaction that is self-sustaining, i.e. the reaction of, for example, two particle in turn causes the reaction of other particles and so on. A chain reaction also grows exponentially, so, in a nuclear fission reaction, say, a neutron colliding with a uranium nucleus causes the uranium nucleus to split (fission), releasing two more neutrons, that will collide with two other nuclei, releasing four new neutrons etc. Critical mass is the mass of a radioactive substance that will cause that substance to spontaneously fission, and cause a chain reaction. In a nuclear bomb of the 'gun' type, a pellet of uranium is fired into the main mass of uranium. This takes the mass of the uranium beyond critical mass, and thus causes a nuclear explosion.
The smallest mass of radioactive material needed to sustain a chain reaction is known as the critical mass.
Critical mass is the minimum amount of nuclear material needed to cause a chain reaction to continue without stopping.
Critical mass is the smallest ammount of fissile material for a nuclear chain reaction to take place. Critical mass is useful in nuclear reactors and nuclear weaponry.
The critical mass. With an amount of U-235 or Pu-239, the smallest critical mass will be a sphere. For a nuclear reactor, it will be the minimum number of fuel assemblies loaded to produce a chain reaction.
The reactor fuel would overheat, melt, and fall apart.
Neutrons are the important particles of nuclear chain reactions and the reactions depend on them. The neutrons do not really start the fission, reaction, however, because the neutrons come from fission in the fuel.The material in the fuel, typically a mix of 235U and 238U, undergoes fission spontaneously. When a fission event happens, more neutrons, typically two or three, are emitted. These bounce about from atom to atom, until they cause another atom to undergo fission, releasing more neutrons to increase the rate at which atoms undergo fission.But the neutrons needed for the chain reaction are actually produced by the fuel spontaneously, and these are produce in an ongoing manner with or without critical mass. So it is not a particle that starts the chain reaction; it is the act of putting together a critical mass.
Oxidation reaction.
carbon is the only material when friction with any material doesn't produce scratches on commutator and avoid to produce spark.
The critical mass. With an amount of U-235 or Pu-239, the smallest critical mass will be a sphere. For a nuclear reactor, it will be the minimum number of fuel assemblies loaded to produce a chain reaction.
The smallest amount of a fissionable material that will produce a self-sustaining chain reaction is called the critical mass. This mass of affected by geometry and other factors such as temperature, pressure, and moderator.
The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called critical mass.
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A catalyst reduces the amount of energy required to produce the reaction. This speeds up the reaction and causes it to finish more quickly. Raising the temperature will also speed up a reaction.
Direct material is that raw material which is required to produce the goods while direct labor is that cost without which no goods can be manufactured.
The reactor fuel would overheat, melt, and fall apart.
This is not a common reaction at standard temperature and pressure.
Direct material is variable cost because to produce any unit of product direct material required which changes with change in production level.
Have you heard of Haber-Bosch process of production of ammonia. This is an example of the question you asked. If we apply the required heat in the beginning of the reaction we do not need to apply it again as its exothermic reversible reaction and will use the heat to continue the reaction. But the rate of reaction is not increased.
Thermal Decomposition is the name of the reaction to produce quicklime from limestone.