sun's rays

> 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, about 109 times big..

We know that energy falling in one second on the unit area of the earth's surface held normal to sun's rays is called solar constant S. Experimentally, S has been found to be equal to 1388 Wm - 2 . Let R be the radius of the sun and r be the radius of earth's orbit aro..

The solar constant is defined as the amount of heat energy received per second per unit area by a perfect black body placed at the surface of the Earth with its surface being held perpendicular to the direction of the sun's rays..

Another important constituent of air is carbon dioxide. As stated before, plants use it to synthesize carbohydrates, a basic food for all of us. It is also one of the green house gases that help to retain the warmth of the suns rays on earth, making weather conducive for l..

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 ..

The stratosphere of the atmosphere has ozone (O 3 ). Ozone is known to absorb the Ultraviolet (UV) rays present in the sun's radiation. The UV rays are believed to cause skin cancer and mutations. Thus, the ozone protects us from the harmful effects of the UV rays..

Solar energy is responsible for the blowing of wind. The intensity of sun-rays is stronger near the Equator than at the Polar Regions. Due to unequal heating of the earth's surface, cooler air from the Polar Regions flow towards the equatorial regions to fill the space created by the ho..

Atmospheric refraction is the shift in apparent direction of a celestial object caused by the refraction of light rays as they pass through Earths atmosphere. The twinkling of stars and variation in size of the Sun are due to atmospheric refraction of starlight. Twinkling of S..

Question: Which component of sun's energy is responsible for drying clothes? Answer: Infra-red rays..

. In the region above the visible portion lie the ultraviolet region (around 10 1 6 Hz) that includes the Sun's rays and the X-ray region. The region with the highest frequency (and lowest wave length) are Gamma rays, which originate from radioactive substanc..