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Artificial Satellites
Tireless Servants in the Sky The space crafts that move in an orbit around the earth are called artificial satellites. Most satellites go around the earth once in about 90 minutes at a height of a few hundred kilometres. But it is possible to launch satellites with a proper speed at greater heights (around 36,000 kms). They would then move around the earth once in 24 hours and As our own INSAT series of satelites are geostationary ,satelites Every night towards thc end of Tv news on my channel. we are shown plctures of Clouds over UK. These pictures are laken by INSAT to earth, Apart from monltofing the weather, INSAT satellites are used to telephone calls. Television Progmmmes He also via these satellites. satellites carry equipment 10 survey the earth's natural resources and monitor weather. India's satellite Programme has also provided useful information on agricultural land and prospecting for ores and minerals. Recently, the satellite IRS 2D in the IRS (Indian Remote Sensing Satellite) series has been launched to smrey India's natural resources by remote sensing methods. The effect of living in space on plants and animals is also studied in satellites.
At present, Russia has a space station called Mir going round the earth as a satellite. Crew members and supplies are regularly sent to misstation where three or:more personswork at time, for periods as long as a year.
Satellites can pinpoint sources of pollution, spot forest fires and locate areas of disease in crops and forests. Weather conditions can be monitored by satellites enabling us to predict storms and prevent damage. Satellites also help in locating and guiding ships. But-the maximum use of satellites is made for communications. Space Probes-Journeying to Neighbouring world; If a spacecraft is di.rected to move out in space, away from the earth, it is called a space probe. Several unmanned space probes have either passed by or landed on the planets Mercury, Venus, Mars, Jupiter, Saturn; Uranus and Neptune. They have sent back valuable data and photographs of all these planets. So we have come to know what these planets look like from near, what they are made up of, and what physical conditions prevail near them.
CHEMICAL EFFECTS OF AIR Wash a small wad of steel wool in gasoline, benzene or carbon tetrachloride (car- bona) to delete any grease. Squeeze it out and then fluff it. As soon
CONSTRUCTION STANDARDS SET BY BUREAU OF INDIAN STANDARDS : At the construction stage itself, the design of the laboratory buildings should be made in accordance with safety norms.
perceived brightness
Ultraviolet Radiations : The ultraviolet (UV) light has higher energy than visible light. Hydrogen lamps, deuterium lamps and other sources of ultra-violet are used for a variety
Explain the Functions of Unicellular Organism You might wonder what functions a single-celled organism is capable of performing. Surprisingly, a unicellular organism is able to
hardness of substances?
respiration in different animals
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
Food Chain: As you know from the discussion of the previous subsection, one of the ways in which the organisms are related is through food, that is, one organism becomes food
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