Nuclear Physics

Plutonium is the best nuclear fuel used in breeder reactors. A breeder reactor is a nuclear reactor that creates more fissile material than it consumes. It requires an initial charge of fissile material, such as plutonium. So, plutonium is the best nuclear fuel.

(i) Optical fibre work on the principle of total internal reflection.
(ii) A nuclear reactor is a device in which nuclear fission can be carried out through a sustained and a controlled chain reaction.
(iii) An electron microscope is a form of microscope that uses a beam of electrons instead of beam of light to form a large image of a very small object. It is based on wave nature of light.
(iv) An electric generator is a device used to convert mechanical energy to electrical energy. It is based on the principle of electromagnetic induction. When a coil is rotated about an axis perpendicular to the direction of uniform magnetic field, an induced emf is produced across it.

A neutron moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction.
Commonly used moderators include regular (light) water (roughly of the world's reactors), solid graphite ( of reactors) and heavy water.

Using the equation