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We see the use of control rods in a reactor to absorb neutrons. These rods are often made of boron.
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What makes a chemical radioactive?
An element is radioactive if its atomic nuclei are unstable. The nucleus contains protons and neutrons; the electromagnetic force pushes the protons apart because they have the same charge, but the strong nuclear force pulls the protons and neutrons together. A nucleus is only stable if it has the right balance of protons and neutrons, and doesn't have any extra energy (if it does, it is said to be in an excited state).An unstable nucleus will sooner or later change its state by undergoing radioactive decay. There are many kinds of radioactive decay, but four are particularly well known:* The nucleus may eject a cluster of two protons and two neutrons, which is called an alpha particle.* A neutron may convert into a proton by emitting an electron (in this context called a beta particle) and an antineutrino.* An excited nucleus may release energy in the form of a photon, called a gamma ray.* The nucleus may break up into two or more smaller nuclei, typically releasing one or more neutrons in the process; this is called spontaneous fission.
What can happen when a fission chain reaction gets out of control?
A chain reaction has products or byproducts that cause the reaction to continue. One example is a state of nuclear critical mass, in which an atom of u-235 decays to produce fast neutrons (along with other fission fragments), which crash into other u-235 atoms, which release more neutrons. The number of neutrons in the environment increases, and if this is not controlled, then there is a nuclear explosion. That is how an atomic bomb works. Another example is a state of instability in snow on a mountain side. If snow begins to move at the top of the mountain, it pushes the snow below it to give way, this pushes the snow below it to give way in turn, going down the mountainside until the snow runs out or the mountain levels out. This is an avalanche. Another example is a situation where the electric grid is overloaded to the point of instability. A failure in a transformer can cause a power surge that causes another failure, this causes other power surges in other places, resulting in other failures. This produces widespread power outage. Chain reactions continue until some sort of equilibrium is attained, or until the unstable features of the situation have lost their energy. In human terms, the results are often destructive or at least dangerous.
What is the organ where the chemical digestion of starch begins?
I don't think of it as an organ, but chemical digestion of starch begins in the mouth, using saliva.
Temperature at which condensation begins?
Dew Point
What happens when a molecule absorbs a photon of infrared radiation?
When molecules heat up they get more Kinetic energy so they move faster n they collode more n they spread far away from each other thats why they r changed from liquid to gas or from solid to liquid
What is the part of a nuclear power plant that undergoes a fission reaction?
The uranium 235 atoms in the nuclear fuel are what actually fission, or split into two other atoms. The uranium is in ceramic fuel pellets that are inserted into fuel rods, that make up fuel elements, that are in the reactor core that is located in the reactor vessel of the nuclear power plant. After the fuel has been in the reactor it begins to produce plutonium 239 atoms within the fuel which will also undergo a fission reaction.
What device in a nuclear power plant creats nuclear energy?
The origin of the energy is the reactor core. Control rods are pulled out of the core to start the reactor, and a controlled chain reaction begins and is maintained. Neutrons released in fissions create other fissions to keep the chain alive. The fissions release energy, much of which is heat energy. The heat is transferred out of the core into the reactor coolant. The coolant transfers the heat into steam generators, and the heat creates steam which is then piped to steam turbines. The turbines drive generators to create electricity, which is then put on the power grid.A link is provided to an article on the nuclear reactor core posted by our friends at Wikipedia, where knowledge is free.BIG PANTS
How hot must the core of a protostar be to begin nuclear fusion?
When the core of a protostar has reached about 10 million K, pressure within is so great that nuclear fusion of hydrogen begins, and a star is born.
What do fuel rods do in nuclear reactors?
Uranium
In nuclear reactors do neutrons travel faster than the speed of light and if so what about the theory of relativity according to which nothing can travel faster than the speed of light?
No, the neutrons produced in nuclear reactors don't travel anywhere near the speed of light. Let's look at this a bit. In the "standard" fission reactor, fissile nuclear fuel is "started up" and the neutron chain reaction begins. Neutrons are produced during atomic fission events, and these neutrons are sometimes called "fission energy" or "prompt" or "fast" neutrons. They are the free neutrons that appear as the result of the fission event. And they're moving pretty darn quick when they're "blown out" of the fissioning nucleus. But they're not moving anywhere near the speed of light. The Boltzman distribution (a fancy way of speaking about the range of energies at which the fast neutrons appear), has a strong peak at close to 2 MeV (20 TJ/kg). That translates into a speed of 28,000 km/s. The speed of light is some 299,792 km/s as we've defined it, and that puts the speed of those fast neutrons at roughly 10% the speed of light.
What pigment absorbs light energy when photosynseis begins?
chloroplasts
What pigment absorbs light energy when photosynthesis's begins?
chlorophyll
What pigment absorbs light energy when protosynthesis begins?
Chlorophyll.
When in the cell cycle does the nuclear membrane begin to fade?
In mitosis the nuclear envelope begins to break in prophase. In meiosis the nuclear envelope begins to break in prophase 1.
What phase of mitosis begins when the nuclear membrane begins to fade?
metaphase
What pigment absorbs light energy when photosynthese begins?
The green pigment in the leave
What is a type of transportation that begins with N?
Nuclear submarine is a type of transportation. It begins with N.
