Laser ,Types and Use

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  LASER :-                    LASER is an acronym of  Light Amplification by stimulated emission of Radiation. It is an optical device which produces an intensive beam of highly coherent, Monochromatic light[ Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength]. It can travel over great distance without spread.   LASER LIGHT :-                                   1. It is very different than normal light and contains only one specific wavelength of light.                                 2. A laser light has very tight beam and is very strong and concentrated.                                 3. A laser light can go to the moon and then come back to the earth without any appreciable change in intensity.                                  4. The light released is monochromatic (consists of only one wavelength) and coherent.  LIPS ( LASER Induced Plasma Spectroscopy) :- It is based on plasma formation on temperature basis, the material absorbs all th
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Tidal Energy, Wave energy,Ocean and Geo-Thermal energy

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Tidal Energy- Due to the attraction of the moon on sea-water, water surface rises and falls, thus the waves are formed. These waves are called tidal waves and energy possessed by rising and falling water tides is known as tidal energy. 
The rise of the sea-water due to gravitational pull of the moon is called high tide whereas the fall of sea-water is called low tide. The tidal waves in the sea build up and recede (rise and fall) twice a day. The enormous movement of water between high tides and low tides provides a very large source of energy in the coastal areas of the world. The tidal energy can be harnessed by constructing a tidal barrage or Tidal dam across a narrow opening to the sea. 
High tide water flows from sea to reservoir and turns the turbine
At High tide, water flows from the sea into the reservoir and turns the turbine.
Low tide water flows from reservoir into sea and turns the turbine
At low tide, stored water flows out from the reservoir into the sea and turns the turbine.

 Limitations of the tidal energy- 
The rise and fall of water during tides is not high enough to generate electricity on a large scale. There are very few places suitable for buildings dams. That's why tidal energy is not likely to be a major source of energy.

 Wave energy
Due to the blowing of wind on the surface of the ocean, very fast sea waves are generated, which have a lot of kinetic energy in them. This energy, with the help of various devices, can be used to rotate the turbine of generator and electricity is generated.

 Ocean thermal energy
The water at the surface of the sea or ocean is heated by the sun while the water in deeper sections is relatively cold. This difference in temperature is exploited to obtain energy. This energy is known as ocean thermal energy.

 Geothermal energy-
The heat from the interior of the earth can be utilised as a source of energy under certain favourable conditions that are created by natural processes. This is known as geothermal energy. It is one of the sources of energy which does not come directly or indirectly from solar energy.

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