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nuclear fission
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∙ 11y ago
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Do electrons move slow or fast around the nucleus?
Electrons do not move fast.
What charge does a beta particle contain?
neutral charge. this is because a beta decay gains a proton and loses a neutron.
What happen to Uranium-238 transformation story?
is the most common isotope of uranium found in nature. It is not fissile, but is afertile material: it can capture a slow neutron and after beta decay become fissile plutonium-239. U-238 is fissionable by fast neutrons, but cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission is probable.
Why does ice melt in warm water?
ice melts in warm water because ice is slow moving molecules so slow they practically vibrate wen heat is added is like Coffee it wakes them up and energizes them cousing them to melt into a liquid
How do you slow down molecules?
You decrease the temperature. Temperature is the measurement of the average speed of the molecules in a substance. The faster the molecules are moving, the higher the temperature. The slower, the lower the temperature.
Why fission cannot take place with fast neutron?
In order to cause an atomic nucleus to become unstable so that it will undergo fission, you have to add a neutron. If a slow neutron collides with an atomic nucleus, it will be absorbed into the nucleus and become part of it. The nuclear attraction of the nucleus is strong enough to grab a slow neutron. But a fast neutron cannot be captured because it has too much kinetic energy. The attraction of the nucleus is not enough to stop the motion of a fast neutron. Even if a fast neutron makes a direct hit on an atomic nucleus, it is just going to bounce off.
Why slow moving neutrons are used in nuclear reacter?
Slow moving (or thermal) neutrons are best for what we really need to do, and that is to force the nucleus to split. Faster moving (or more energetic) neutrons have a tendency to bounce off the nucleus or go completely through, resulting in a non split condition. This is wasted energy. The neutron needs to go slow enough to be captured in the nucleus, and stay there long enough to destabilize it, causing it to split. In fact, we use a moderator (such as water in US light water reactors) to slow down the neutrons, which increases reactivity (K-Effective).
What is it called when unstable nuclear atoms are split unto two?
either atomic decomposition or nuclear fission, fission being a uranium-235 or other such isotope having a slow moving neutron fired into it's nucleus.
Why U 235 is fissioned by thermal neutron while U 238 by a fast neutron?
It's to do with the capture cross-section of the nucleus. It just happens that the U-235 nucleus has a much larger cross-section for neutron capture when the neutrons are slow, and that the subsequent nucleus is unstable and splits into two parts. With U-238, it does not undergo fission at all, it just absorbs the fast neutron and transmutes to Pu-239. As to the fundamental reason for this, it is in the complex nuclear physics field of study
When a neutron strikes a nucleus of an atom and causes it to split into two smaller nuclei and another neutron what is released immediately?
In fact when a slow neutron is absorbed by a U-235 nucleus and fission results 2.5 neutrons are ejected on average. There is also a gamma radiation release, and the two fission fragments you refer to have initially kinetic energy which then becomes converted to thermal energy as they are quickly stopped in the fuel.
Can you say that atoms cannot be changed?
Atoms consist of a nucleus and electrons surrounding the nucleus. You can not change the nucleus by ordinary chemical means but you can remove electrons. However, since the electrons are easily replaced the atom is not considered fundamentally changed by removing electrons, but it is changed. There is a way to change a nucleus that's called "neutron activation" . This involves bombarding the nucleus with slow moving neutrons and letting the nucleus adsorb a neutron. This makes the atom a little heavier and can sometimes make the atom radioactive. Neutron activation is not considered a chemical process but it is a way to change the atom. So I would say it is incorrect to say an atom cannot be changed. Atoms can be changed but its not easy.
What is the effect of slow neutron on nuclear reactions?
Because of neutron multiplication ratio.....
What does neutron absorbtion accomplish in a nuclear reactor?
It is the absorption or capture of slow neutrons by the uranium nucleus that causes it to fission and release energy, so it is the essential factor that makes nuclear energy work
Are alligators slow moving or fast moving?
They are generally slow.
What is elastic collistion?
Elastic collision deceleration is the transfer of energy from an accelerated body to another one that results in the deceleration of the first body by some degree. An example might be the elastic collision and deceleration of, say, a neutron in a nuclear reactor. When a fission event occurs, a neutron leaving the scene will be moving like a bullet from a gun. As the neutron doesn't have a charge, it cannot slow by anything other than elastic scattering, a collision with something. It needs to transfer some energy into whatever it hits to slow down. If it slams into the nucleus of, say, an iron atom, that's not so good. (Iron is the major component in steel, which the reactor vessel is made out of.) The iron nucleus is over 50 times as massive, and the neutron can't give it much energy to slow down. That'd be like trying to slow a high speed golf ball down by having it slam into, say, a bowling ball. Not the best thing in the west if we want to slow the golf ball down. (We do need to slow the neutron down in the reactor, by the way.) So what can we use to slow down a neutron? Let's see. We need something near its own size. How about a proton? Like the protons in hydrogen nuclei in water molecules? Oooo, snap! We use water as the heat transfer medium in our reactor and it does double duty as the moderator, or "slower-downer" of neutrons. An elastic scattering deceleration event occurs when a neutron slams into a proton. The proton is knocked across the room and the neutron comes away with less energy. The neutron is said to have decelerated in an elastic scattering event. The slowing neutron is moving to a lower energy state. Toward a state of thermal energy. It is being thermalized. It's slowing down in a thermonuclear reactor. As Paul Harvey would say, and now you know the rest of the story....
Is chyme a slow moving or fast moving liquid?
It's a slow moving semiliquid.
What is slow moving river of ice definition?
A "slow moving river of ice" is a glacier. A slow moving chunk of ice floating down a river is a "floe".
