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13y ago

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.

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11y ago

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.

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14y ago

The smallest mass of radioactive material needed to sustain a chain reaction is known as the critical mass.

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7y ago

Critical mass is the minimum amount of nuclear material needed to cause a chain reaction to continue without stopping.

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12y ago

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.

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Q: Critical mass is the of material required to produce a chain reaction?
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What is the amount of fissionable material that must be present in order for a nuclear reaction to take place called?

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.


What happens if a nuclear chain reaction is not controlled?

The reactor fuel would overheat, melt, and fall apart.


What particle is needed to begin a nuclear chain reaction?

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.


What reactions produce electrons?

Oxidation reaction.


Why brushes are made up of carbon?

carbon is the only material when friction with any material doesn't produce scratches on commutator and avoid to produce spark.

Related questions

What is the amount of fissionable material that must be present in order for a nuclear reaction to take place called?

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 give a self-sustaining chain reactions is called the?

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.


What is the minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called?

The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called critical mass.


What is required to produce the chemical reaction of hydrogen and oxygen?

Lol trying to blow up the ocean


Whether raw material required to produce the goods consumed by people is sufficient?

chat with me Spell check your answer


How does a catalyst speed a reaction at low temperature?

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.


What is direct metrial and direct labor?

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.


What happens if a nuclear chain reaction is not controlled?

The reactor fuel would overheat, melt, and fall apart.


How many moles of aluminum are required to produce 4 moles of hydrogen?

This is not a common reaction at standard temperature and pressure.


Are direct materials fixed costs?

Direct material is variable cost because to produce any unit of product direct material required which changes with change in production level.


Is an exothermic reaction will produce heat and will be reabsorbed to increase the rate of reaction?

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.


What reaction takes place to produce quicklime?

Thermal Decomposition is the name of the reaction to produce quicklime from limestone.