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Why do neutrons reactor diffract when they pass through a crystalline solid when heatd at 300K?
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In nuclear reactor heavy water is used as?
Heavy water (deuterium) functions as a moderator. It slows down fast neutrons released by fission reactions in order to allow the reaction to be sustained. Fast neutrons pass through the reactor before initiating another fission reaction.
Why are metals such good conductors?
because of their high density. They are good conductors of electricity because their crystalline formation allows negative flowing neutrons to pass through
How x-ray crystallography can be used to determine the crystalline structure of solid substances such as sodium chloride?
As x-rays pass through a crystal, such as NaCl, the atoms diffract, or bend the x-rays in certain directions and angles, giving a characteristic pattern on x-ray film. The specific pattern can be used to determine the crystalline structure and distance of the atoms from each other, among other things.
How a ringing telephone can be heard through a closed door?
You can hear it because of driffraction. The sound waves diffract through the openings.
Neutron activation is done most easily at a nuclear reactor facility. Why can't a lamp or an X-ray tube be used to add neutrons to an object's nuclei?
A lamp or an X-ray tube cannot be used to "add neutrons" to other nuclei because lamps and X-ray tubes are not neutron sources. Neutron activation is generally something we do in an operating nuclear reactor. In the core of the reactor, there is a high neutron flux. Many, many neutrons are being released in the fissions that are going on in the nuclear core. Materials that are to be activated are lowered through ports and brought down into the neutron flux. Activation occurs. Lamps or X-rays do not produce neutrons, and cannot be used in neutron activation activities. No neutrons means no neutron activation.
Do waves diffract best when their wavelength is similar in size to the opening they are moving through?
Yes i took this question yesterday in science
What 3 solids will allow light to travel through them?
glass, plastic, crystals (although a crystal wil lallow light to pass through it, it will also diffract the light)
What is the process by which spent uranium can be reclaimed in fast-neutron reactors?
Spent uranium is usually reclaimed in thermal-neutron reactors. This process is possible only in CANDU reactors and other similar types, which use heavey water as a moderator (a moderator slows neutrons to a speed at which they are more likely to be absorbed by a nuclei, as the neutrons impact the molecules of the moderator and are slowed). Normal water (usually refered to as light water when dealing with nuclear reactors) is H20, H being a hydrogen atom, which does slow the neutrons, but it also sometimes absorbs neutrons that impact it. This means less neutrons are getting through to the reactor core, which means once a fuel bundle has less than a certain percentage of fissionable material left in it (idealy it should be about 5% for commercial reactors, that it, before it has been used. It can only continue to be productive in a light-water reactor above about 1- 2%.), not enough neutrons are getting through to keep the reactor critical (the point where enough neutrons are being released from fissions to sustain a chain reaction), and the fuel is discarded. Heavy water, on the other hand, is D2O, with two deuterium atoms (an isotope of hydrogen which has 1 proton and 2 neutrons, instead of the regular 1 and 1). This means that the hydrogen atoms already have an extra neutron, making them less likely to absrob the neutrons they are supposed to be slowing down. Thus more neutrons are getting through, and there are enough to cause fission in a significant portion of the remaining fissionable material, allowing such reactors to run on depleted uranium.
Is diffraction more pronounced through a small or a large opening?
A smaller opening because it is harder for a wave to travel through smaller openings so after passing through it will diffract more.
In a nuclear reactor why does the moderator need to slow down the neutrons?
Nuclear fission of Uranium-235 is more efficient when hit by neutrons with low energy of the order of electron volts. However, neutrons coming from fission are at high energies around 2 megaelectron volt. Accordingly, the moderator is needed to slow down the neutrons coming from fission to low energy values through scattering process with moderator molecules. This is the concept of the so called "thermal nuclear reactors"
What do we call the materials that refracts light?
Refraction is caused when light changes the medium that it is moving through. Therefore any material that is transparent to light will diffract it.
Where is earthing provided in glass line reactor?
Through thermowel tip ( made up of tantalum ), earthing is provided to Glass lined reactor.
