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Why is it more difficult to start a fusion reaction than fission?
Wiki User
∙ 13y ago
Fission reactions start naturally if the proportion of U-235 is high enough; there is evidence this has happened in places in Africa in the distant past of Earth's history.
Fusion reactions require more heat and pressure than we really know how to provide so as to keep a reaction going.
Wiki User
∙ 13y ago
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Why a fission reaction is neccasary for fusion reaction?
It isn't, in general. Thermonuclear bombs use a fission bomb to generate the heat and pressure required to start the fusion process, but there are other ways of doing it (stars do so by gravity, for instance).
Why do you use fission reactors not fusion reactors?
No way has yet been found to reach break-even in a controlled fusion reaction and get as much energy out as was needed to put in to start the reaction. To make a reactor you need to go past break-even and release extra energy.
How is fussion bomb different from a fission bomb?
Fusion reaction combines isotopes of hydrogen to make helium and release energy. This requires temperatures in the millions of Kelvins to start.Fission reaction breaks up isotopes of heavy elements (Uranium & Plutonium) into lighter elements (fission fragments, a major part of fallout) and release energy. This can start a normal temperatures.
Why is it so difficult to get fusion reactors to work?
The temperatures and pressures are too high to hold for long enough periods to get as much energy from the reaction (or more) as was put in to start it.
How do neutrons work?
There are 2 types of nuclear reaction: fusion and fission. Fusion is when 2 or more nuclei of atoms join together, fission is when one nucleus splits into two of more pieces. Larger nuclei tend to fission while smaller ones tend to fuse.With fusion the aim is to fire the nuclei at each other fast enough so that they get close enough to stick together. This gives off lots of energy and is the primary energy source of modern nuclear weapons. For fusion of nuclei smaller than iron's the energy given off is enough to speed up nearby nuclei to the point where they fuse to. This leads to a chain reaction resulting in a massive explosion.In fission a neutron is fired at a large nucleus, usually of Uranium or Plutonium. this de-stabilises it causing it to break apart. This gives off energy and fast-moving neutrons (which hit more nuclei and cause more fission, a chain reaction). This is what was used in old-fashioned nuclear weapons and is now used in nuclear power plants.Fission gives less energy than fusion (per nucleon) but is easier to start and control than fusion. You can stop a fission chain reaction by introducing cooling rods. The cooling rods absorb neutrons, stopping the process. The heat given off in the fission chamber of a nuclear power plant is used to boil water, which turns a turbine, which generates electricity.
Why a fission reaction is neccasary for fusion reaction?
It isn't, in general. Thermonuclear bombs use a fission bomb to generate the heat and pressure required to start the fusion process, but there are other ways of doing it (stars do so by gravity, for instance).
Why are fusion reactors not yet present day reality like fission reactors?
Only beacuse of starting trouble. Any way we need billion kelvin temperature to start with for which we have to rely on fission reaction. One more important point we cannot have a controlled fusion reaction as we do so in fission ie nuclear reactor using control rods.
Maximam dengrus bomb between nuclear bomb or hydrogen bomb?
If you are asking which has the maximum danger, a hydrogen bomb is one type of nuclear bomb. In general, nuclear bombs can be fission (called atomic) or fusion (hydrogen) A fusion bomb is larger than an fission bomb, and actually uses a fission bomb to start the fusion reaction.
Which type of nuclear reaction is used in modern-day nuclear reactors?
Nuclear fission is used in nuclear weapons to create what some might call an atomic blast (nuclear blast). Nuclear fission used this way can also be applied in special complex designs to generate enough thermal energy (heat) to initiate a fusion reaction. This creates an even bigger nuclear blast.
Is nuclear fission happening on the sun or nuclear fusion?
Fusion. Fusion requires very high temperature and pressure. So on earth we usea critical mass of weapons grade uranium to start a fission chain reaction whichenables a fusion reaction in hydrogen. Fusion is of course more powerful than fission
What particle is used to start nuclear fission?
In actuality, a spontaneous fission event begins a nuclear chain reaction. It kick starts a nuclear chain reaction. And a neutron from that fission will initiate another fission to continue and rev up that nuclear chain reaction.
Why do you use fission reactors not fusion reactors?
No way has yet been found to reach break-even in a controlled fusion reaction and get as much energy out as was needed to put in to start the reaction. To make a reactor you need to go past break-even and release extra energy.
How is a star is made?
Collapsing matter and gasses get denser and denser until nuclear fusion and fission start.
How is fussion bomb different from a fission bomb?
Fusion reaction combines isotopes of hydrogen to make helium and release energy. This requires temperatures in the millions of Kelvins to start.Fission reaction breaks up isotopes of heavy elements (Uranium & Plutonium) into lighter elements (fission fragments, a major part of fallout) and release energy. This can start a normal temperatures.
How much energy is needed to start nuclear fission reaction?
Incomplete question
Nuclear energy is an alternate energy source produced from atomic reactions?
There are two: Nuclear Fission and Nuclear Fusion. Fission is when a neutron is fired at an element with a high atomic number (usually Uranium) which then splits, releasing energy and more neutrons. this produces a chain reaction, which continues until all nuclei have been split. Fusion occurs in stars and a few experimental reactors, and happens when two forms of Hydrogen nuclei (Deuterium and Tritium) fuse into an unstable nucleus, which in turn splits again into Helium and a spare neutron. Fission can start at any temperature, but Fusion only when Hydrogen is in a plasma state.
Why is it so difficult to get fusion reactors to work?
The temperatures and pressures are too high to hold for long enough periods to get as much energy from the reaction (or more) as was put in to start it.
