please answer

Asked by Sanjula | 11th Jun, 2009, 11:28: AM

Expert Answer:

4)

A nuclear reactor is a device in which nuclear chain reactions are initiated, controlled, and sustained at a steady rate, as opposed to a nuclear bomb, in which the chain reaction occurs in a fraction of a second and is uncontrolled causing an explosion.

The fuel used is usually  uranium-235, plutonium-239 or plutonium-241. 

In nuclear engineering, a neutron moderator is a medium which reduces the velocity of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.

 

Answered by  | 12th Jun, 2009, 02:27: AM

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