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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.
Rockets or Launch Vehicles: Every flight into space begins with a rocket launching. The rocket can lift a satellite or spaceship carrying human beings and equipment into space
compare and contrast the hydra to one of the protozoan observed in class
Hazards of a Nuclear World : The-picture painted abdve seems rosy. Yet, it does have a few shades of grey. There are many risks associated with the use of nuclear fission ene
what is non renewable and renewable resource
A hair hygrometer This device will enable you to read the relative humidity directly without the use of tables. Procure a few human hairs about 30 cm long. Free them from gr
Paper manufacture: Paper was not used in India until the eleventh century. This Chinese invention of the first .century A.D. reached India mainly through the Ghorian conquerors
Functional unit of the nervous system-neuron: The human brain is composed of more than one hundred billion (100,000,000,000 or 1011) cells called 'neurons'. This number which
compare pisces and amphibian
What is the name for the margin where two plates in the lithosphere slide past each other? Transform Fault Margins
how is the soil colloidal material look like when ion and cation exchange capacity of the soil?
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