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Lasers : Laser light is an extremely intense form of electromagentic radiation and its name is acronym for light amplification by stimulated emission of radiation. Lasers are used widely in industry and research laboratories. Their dangers stem from the enormous concentration of the energy of the laser into a very small area. These extremely short, concentrated pulses of light can cause severe eye damage. Both the cornea and the retina may be affected and permanent blind spots can be produced at the points where the lens of the eye brings the rays to a focus, thereby destroying the tissues at the back of the eye.
This focussing effect of the lens of the eye increases the intensity of the laser light by a factor of about a million (106)so low energy laser light can also be dangerous. In practice the maximum safety value is set at one-tenth of this figure. Additional dangers in the use of the laser stem from the very high voltages required to operate its source.
What is shale? It is a fine-grained, earthy, sedimentary rock like clay, but produced in thin layers.
about solar system how does it works
Observing pollen grains from different flowers First of all we have to Secure several flowers in which the pollen has formed on the stamens .Shake pollen from each kind of flo
Placement of First Aid Box : All first aid equipment should be placed close to the sites where accidents are likely to occur. The location of first aid boxes should be such that t
1) Consider the diagram below, where a pump is used to draw water from a lake to feed an irrigation system. a) Which of the points of departure the minimum water flow takes
It is estimated that the temperature of the Earths core is: as hot as the surface of the sun
Explain Functions of the Pancreas - Neutralising action Neutralising action: Pancreatic juice is alkaline in nature and acid chyme is rendered alkaline by the strong alkalinity
Question : a) Define i) relative humidity. b) Why is it generally cloudy in the vicinity of a low pressure area and sunny in the vicinity of high pressure? c) What are th
How old is the earth Ans) The earth has only very freshly been accurately dated. Until astonishingly recently, the earth was thought to be anywhere among a few hundred thousand
Explain the Mechanism of Phagocytosis In phagocytosis, the organism is entrapped into vacuoles known as "Phagosome". The cytoplasmic granules, organelles or lysosomes fuse with
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