What moderator is used in a nuclear reactor? What makes compulsory the use of a moderator?
Graphite or heavy water is used as moderators in nuclear reactors. When the high speed neutrons collide with the moderator, they lose some of their kinetic energy and get slowed down.
Moderator is used to slow down the speed of neutrons produced because fast moving neutrons cannot cause fission of Uranium-235 effectively.
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Indicate in symbols any three isotopes of uranium. Which among these is used for nuclear fission? What is meant by criticality of a nuclear reaction?
Which of the following phenomena may help in the making of more destructive weapon? (i) Nuclear fission (ii) Nuclear fusion. Name the weapon.
Write the principle of working of hydrogen bomb. How is hydrogen bomb accomplished?
Enumerate the factors that should be counted for choosing source of energy.
