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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.
Explain the amount of Glucose in Urine Detectable amount of glucose is only found in the urine when the blood level exceeds a certain threshold value i.e., 180 mgI100 ml. In un
Explain Pus Formation Once a neutrophil finds a foreign particle or a bacterium, it will engulf it releasing enzymes, hydrogen peroxide and other chemicals from its granules to
Genetic Engineering: The modem biotechnology revolution is based on the understanding and manipulation of the structure of DNA. DNA is a complex organic molecule that directs
How to make an overflow can and catch bucket These are useful for the study of Archimedes' principle, which controls floating and sinking. To make an overflow can secure a tin
adding vector
Specific gravity and pH of Urine Normally, the first morning urine has a specific gravity of 1.015 to 1.020. Normal urine is usually slightly acidic with a pH of about 6.0.
Cloning, science vs. religion
The rain cycle You can reproduce the rain cycle in miniature in your classroom. Place a box of plant seedlings on the table. Place a metal tray about 35 to 40 cm above the box
Explain the Function of Saliva -Taste Food substances, mixed with saliva stimulate the taste buds. Saliva acts as a solvent and is essential for the sensation of taste.
For water soluble/miscible solid and liquid wastes The familiar method of mopping the waste with plenty of water and running the same into the drainage could be done for miscib
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