The Sun
> kilometers from the earth. Sun's light travels at a great speed of 3x10 5 kilometers per second, and takes about 8 minutes to reach us. Light takes about 4.3 years to reach us from the next nearest star called Alpha Centauri. The sun is a mass of hot gases,..
Weather Satellites
Weather Satellites - Scientists who investigate weather phenomenon are called meteorologists. To study a particular feature, may require an observation from a larger area. By combining great number of observations and analysing them by computers it is possible to get information..
Speed of Sound
The flash of lightning due to collision of clouds is seen much before the thunder, although both occur simultaneously. This happens because the velocity of light is greater than the velocity of sound. The speed of sound depends on (1) elasticity and (2) density o..
Speed of Sound
The flash of lightning due to collision of clouds is seen much before the thunder, although both occur simultaneously. This happens because the velocity of light is greater than the velocity of sound. The speed of sound depends on (1) elasticity and (2) density of the ..
Speed of Sound
The flash of lightning due to collision of clouds is seen much before the thunder, although both occur simultaneously. This happens because the velocity of light is greater than the velocity of sound. The speed of sound depends on the properties of the medium throug..
Greenhouse effect around the Earth
Green house gases in the atmosphere behave much like the glass panes in a green house. Green houses are like small glass houses whose transparent glass roof and walls allow sunrays to pass through. It keeps the heat from escaping, thus allowing vegetables and flowers to grow even in cold weat..
Wind Energy
Wind energy is one of the first sources of energy known to man. The sun's rays are stronger nearer the equator than in the polar region. This heats the air in equatorial region and warm lighter air rises while cooler polar air moves in to replace it. This movement of air results in wind. ..
Force of Gravitation
What do you observe when you drop a stone from a height? The stone which was initially at rest starts moving towards the ground and attains a maximum speed just before it touches the ground. Is the stone moving with a constant speed? No, it is not moving with uniform h..
Force of Gravitation
Drop a stone from a height. What do you observe? The stone which was initially at rest starts moving towards the ground and attains a maximum speed just before it touches the ground. The stone is not moving with uniform speed. Its speed keeps changing at ever..
Polar Orbit
. There are weather satellites which monitor wind speed, cloud temperature and height, sea temperature, etc. This data helps to predict climate changes. Spy satellites use powerful telescopes to watch for potential threats. There are also Remote Sensing Satellites. Remote sensin..
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