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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.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThe neutron is used to begin a nuclear chain reaction.
Wiki User
∙ 12y agoThe neutron starts a nuclear chain reaction. Sometimes, however, the fissile material can fission spontaneously.
Wiki User
∙ 13y agoslow moving neutron
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∙ 11y agoproton
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What happens to a particle of a substance when it expands?
individual particles do not expand, when a substance expands it is the dead space between the particles that expands and the particles begin to move around (assuming the substance was solid to begin with). If a particle did expand it would loose cohesion and break apart (possibly creating an atomic reaction depending on how it was expanded)
How do you stop or slow the nuclear reaction in a nuclear power plant?
Once a meltdown occurs at a nuclear power plant, there is no way to stop or slow the reaction. However, Nuclear power plants are the most technologically advanced power plants in the history of man-kind. The meltdowns themselves are incredibly rare, but if they do occur the immediate areas are instantly alerted and evacuated. The contamination of the surrounding area is typically not very quick to begin with, as the walls of structures of Nuclear Power Plants are very thick and designed to withstand nearly anything thrown at them. Of anything that could happen, a meltdown at your area Nuclear Power Plant should be at the very bottom on your list of concerns.
What 2 types of energy does nuclear bombs use?
Chemical energy- to begin the explosion- and nuclear energy- the main explosion.
Was Einstein involved in creating the nuclear bomb?
Other than writing the letter to Roosevelt at the request of Leo Szilard (who held the Nuclear Chain Reaction patent already), which got Roosevelt to begin a study committee with a budget of $6000, Einstein did not participate. Eventually the committee recommended starting a full development program, which became the Manhattan Project.
What is the critical temperature at which nuclear reactions begin?
For nuclear fission reactors there is no critical temperature, though they do have a temperature coefficient which makes the efficiency of the chain reaction vary slightly with temperature. This can be negative or positive, obvously a negative coefficient is preferred and is safer. Nuclear fusion is another matter, and very high temperatures are required in tokamaks to get fusion started
What particle is needed to begin nuclear chain reaction?
Neutron particle is needed to begin nuclear chain reaction.
Why is it necessary for a collision between atomic particles to occur so a nuclear reaction may begin?
High Energy produced with high velocity which required for nuclear reaction
What is needed to begin a chemical reaction?
The most important: to have the reactants !
Why is a spark of energy needed to begin the chemical reaction of burning fossil fuels?
You need to get the reaction above its activation energy before it will start.
What are the names of the particles involve in a nuclear reaction?
If we are just considering the "basic" nuclear reaction in a "regular" nuclear reactor, the particles of interest are the uranium-235 atoms (which are fissionable), and the neutrons, which get loose and cause fissions when they are absorbed by the U-235 atoms. We could broaden this to include some other reactions, but this is a fabulous place to begin to investigate nuclear physics.
What is the past particle of Begin?
"Begun" is the past participle of "begin."
What happens to a particle of a substance when it expands?
individual particles do not expand, when a substance expands it is the dead space between the particles that expands and the particles begin to move around (assuming the substance was solid to begin with). If a particle did expand it would loose cohesion and break apart (possibly creating an atomic reaction depending on how it was expanded)
What describes the energy of activation?
Activation energy is the least amount of energy needed to start a chemical reaction. It is used to activate atoms or molecules in order for them to begin a chemical reaction.
How do catalyst affect the energy of reaction?
Catalysts greatly reduce the amount of activation energy needed to begin a reaction.
What caused the nuclear reactor to begin to melt down in japan?
the cause of the melt down of the reactors in japan is the water that is needed to cool down the reactors
When did the nuclear age begin?
1945
How do reactions begin?
one particle has to travel rely fast
