Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Nuclear Reactor:
Nuclear fission can be maintaned as a controlled cjiain reaction in a nuclear reactor to produce energy. Fermi had found from experiment that slower moving neutrons were more effective in causing nuclearfission. But most neutrons produced by the splitting of the nuclei are quite fast. A way was required to slow them down. It was found that certain materials slow down the neutrons. Graphite. a pure form of carbon, is one such material. Such materials are called moderators. There was still the problem of controlling the chain reaction so created, that is, to stop the , reaction or allow it to proceed at will. Materials which absorb neutrons would serve to control the reaction. The neutrons absorbed by such materials would be removed and would no longer split atomic nuclei. And the reaction would be controlled. The material usually chosen as an absorber of neutrons, is cadmium or boron steel. In a nuclear reactor . rod-like containers of Uranium-235 are inserted in holes made in a huge block of graphite. The graphite block slows down neutrons to enhance the chain reaction. Control rods of cadmium are also inserted into the graphite block. When pushed out, they absorb fewer neutrons and the reaction is speeded up. The problem, then, is to remove the heat and use it to generate electrical energy. This is achieved by circulating water, or liquid sodium to absorb the heat generated in the graphite block. This heat may generate steam, which can turn a turbine (a wheel with slanting blades) anqhe connected electrical generator.
Today we have reactors capable of yielding power upto 500 Megawatts. Smaller reactors which give 1 to 5 Megawatt power are mostly used for reseasch work. The large ones are used for producing electricity, and driving submarines, or ships. From the uranium rods used in the reactor, another fissionable material like Plutonium 239 may be obtained.
Enumerate in brief about the Earthworms There are several species of earthworms, having slender cylindrical bodies with varying diameters. These organisms ingest the dead organ
how foods are digested?
Why is the idea of modern human "races" is not considered a valid biological concept, and why is the idea of clinal variation more acceptable to biologists?
Explain Fate of the Neurotransmitter Postsynaptic membranes bind the neurotransmitters by an active process. The chemicals keep moving in and out of the membrane. The synapse t
Ask question how many years that our earth survived?#Minimum 100 words accepted#
Mechanics: Another hnch of science which is, perhaps, the greatest contribution of Greek civilisation is mechanics. Mechanics developed out of the necessities of imgation,
Ask quesdifference between prokaryotic and eukaryotic fatty acid synthesistion #Minimum 100 words accepted#
A weather picture A piece of white blotting paper is immersed in a solution having two parts cobalt chloride to one part common salt. While wet the paper will stay pink, but wh
Primary source from plants for humans and animals
Hormonal system: Most of us are not even aware that another system works constantly, along with the nervous system and the muscles, to direct our bodily functions. The system
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd