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प्रश्न
What is nuclear energy? Explain the principle of producing electricity using nuclear energy is a nuclear reactor.
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उत्तर
The process whereby an atomic nucleus breaks up into two or more major fragments with the release of a tremendous amount of energy is called nuclear fusion and the energy thus released is nuclear energy.
Principle: The production of electricity using nuclear energy is based on the principle in which steam is produced by heating water through heat energy released during the controlled nuclear fission of uranium-235 (or plutonium-239). When atoms of uranium fuel are hit by neutrons they fission (split), releasing heat and more neutrons. Under controlled conditions, these other neutrons can strike more uranium atoms, splitting more atoms, and so on. Thereby, continuous fission can take place, forming a chain reaction releasing heat. The heat is used to turn water into steam that, in turn, spins a turbine that generates electricity. At present nuclear power is used to generate 3% of all the country’s electricity.
संबंधित प्रश्न
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
Write the type of energy possessed in the following case:
A wound-up spring
State the energy changes which take place when:
In a heat engine.
Give one example when:
Kinetic energy to potential energy.
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
