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Moderators are used in nuclear reactors to slow down the speed of neutrons. By slowing the neutrons down the probability of a neutron interacting with Uranium235 nuclei is greatly increased thereby maintaining the chain reaction. The neutrons produced by nuclear fission are very fast. At that speed the probability of the neutron causing a fission with another uranium or plutonium becomes low. Neutrons become slow by colliding with a moderator and thus the probability of further fission increases. Solid graphite, heavy water are some of the moderators used. Hence, option D is correct.
Which type of drainage pattern is characterized by streams that resemble branches of a tree?
Which is the only muscle in the human body that is NOT attached at both the ends?
The term Vitamin is coined by?
Which of the following hormone used as the medication to facilitate childbirth?
What part of the Litchi fruit is commonly consumed?
The study of lizards is known as
What is the chemical name of Vitamin B5 ?
Name a reproductive strategy in which parasites take advantage of the care of other individuals of the same species or different species to raise their ...
Which among the following disease is not caused by Protozoa ?
Who discovered the cell in 1665?
