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 th...
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Centripetal and Centrifugal forces and Application

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What is the Centripetal Force?
 A Body performing circular motion is acted upon by a force acted along the radius towards the centre of the circle. This force is called the Centripetal Force.

   Centripetal force = Mass ✖ Centripetal acceleration
Difference between the two forces in given diagram

 What is Centrifugal force?
It is regarded as the reaction of the centripetal force. It acts along the radius and away from the centre of the circle.
[Centripetal works towards the centre and Centrifugal away from the centre]

 Applications-
When a vehicle goes around a curved road, it requires some centripetal force. So, to provide the necessary centripetal force, outer edges of the curved road is raised above the inner edge. This provides a component of the normal reaction of the road and provides the centripetal force. This phenomenon of raising other edges of the road is called Banking of the roads.

 - Cream separator;
                                                                  It is a device working on centrifugal force. It is a vessel containing milk. On rotating fast, the lighter particles of cream collected in a cylindrical layer around the axis and skimmed milk are drained through an outlet. The particles that are lighter than liquid driven towards the axis and those are heavier than liquid driven away from the axis. So, we found butter on the vessel's wall and remain near the axis. [ working in the diagram]

 Washing Machine Drier; 
                                                                                    It is based on the Principle of Centrifugal Force. In washing machine drier, wet clothes are dried by packing them in a cylindrical vessel with perforated walls which are rotated with very high speed. Due to centrifugal force, the water particles move through the walls of the vessel and escape through the holes. it is all about heavy things going away from the centre and lighter remain at the centre.





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