each other. This repulsive force will be overcome by the kinetic energy of the nuclei at higher temperature of the order of to K. . .
Stellar Energy The stars like our Sun emit a large amount of energy in the form of light and heat. This energy is termed as the stellar energy. Where does this high energy come from? All stars contain a large amount of hydrogen.
The surface temperature of the stars is very high which is sufficient to induce fusion of the hydrogen nuclei. Fusion reaction that takes place in the cores of the Sun and other stars results in an enormous amount of energy, which is called as 'stellar energy. Thus, nuclear fusion or thermonuclear reaction is the source of light and heat energy in the Sun and other stars. .
. Hydrogen Bomb Hydrogen bomb is based on the principle of nuclear fusion. A hydrogen bomb is always designed to have an inbuilt atom bomb which creates the high temperature and pressure required for fusion when it explodes. Then, fusion takes place in the hydrogen core and leads to the release of a very large amount of energy in an uncontrolled manner.
The energy released in a hydrogen bomb (or fusion bomb) is much higher than that released in an atom bomb (or fission bomb). Sun fuses about million metric tons of hydrogen each second and radiates about . × joule of energy per second. When this energy is radiated towards the Earth, it decreases in its intensity.
When it reaches the Earth its value is about . kilo joule per unit area in unit time. . USES OF RADIOACTIVITY Many radio isotopes can be obtained from radioactivity.
These radio isotopes have found wide variety of applications in the fields of medicine, agriculture, industry and archeological research. . . Agriculture The radio isotope of phosphorous (P- ) helps to increase the productivity of crops.
The radiations from the radio isotopes can be used to kill the insects and parasites and prevent the wastage of agricultural