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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.
Nucleic acids are polymers of nucleotides. Nucleotides are nucleoside phosphates.
Metabolism All of the organized chemical reactions in a cell which are under the control of enzymes.
Role of communication in promoting education: Transmission of knowledge and information, which is the first step in education, is obviously possible only through communication
REQUIREMENTS Chemicals The following materials are common for the whole batch of students at the Study Centre, since this is a demonstration exercise. Acetone (or ethyl meth
Making a 'burp' bottle Fit a bottle or flask with a single-hole stopper which carries a funnel. Put the stopper firmly in the bottle and then pour water into the funnel. The bo
Medieval Science: We can record the sum total of the medieval achievement in the natural sciences in a few lines. It can be put down as a few notes on natural history a
Ribonucleic acid (RNA) and deoxyribonucleic acid (DNA) have ribose and deoxyribose as the pentose sugar, respectively. They also differ, to some extent, in possession of nit
The Twenty Point Programme and Communication : In view of what we have discussed above, it may be useful to have a look at the Twenty Point Programme (1986), which the Governme
How do time and temperature work in soil formation? The time taken for the soil formation may be more in some cases or less in others. Hard rocks require more time as comp
Explain Asphyxia - Histotoxic Hypoxia Improper aeration of blood produces a series of pathological manifestation and ultimately death. The symptoms are collectively called asph
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