Beautiful sun (12 photos)
The light emitted by various light sources, the length and intensity of light waves, and the different proportional properties form different colors of light, which is called light source color.
The color of light source is an important factor that affects and determines the color of objects. 1666, isaac newton, a British scientist, made the dispersion experiment of separating the solar beam with a prism for the first time, and thus proved that the white light of the sun is composed of various colors.
Sunlight is the most important natural light source. It shines on the earth and makes the whole world colorful. When the light changes with time and weather, it will directly affect the color of the image.
Besides sunlight, there are other kinds of light sources, such as lamps used in our daily life. It is an artificial light source, which is much weaker than sunlight and contains different proportions of visible light. Generally, the light emitted by incandescent lamps is often red and yellow, while the light emitted by fluorescent lamps is blue.
"The sun is the mother of the earth", and it is because of the sunshine that the earth is full of vitality. The wind blows wildly, the river flows, flowers bloom and fruits ripen, and life is endless. The sun is an inexhaustible resource in 5-6 billion years. At present, people are trying their best to make use of solar energy.
In the 1970s, the number of meteorological observation stations increased, and it was found that the eastern Sahara desert had the most sunshine, with an average annual sunshine hours of 4,300 hours. In other words, you can see the bright sunshine for about 1 1 hour for 45 minutes every day.
Why is there so much sunshine in the East Sahara Desert? Because this is the driest place in the world, there is no cloud that can block the sun; Coupled with the low latitude and long sunshine time, it has become the place with the most sunshine in the world.
The speed of light reaches 300 thousand kilometers per second, and it takes 8 minutes from the sun to the earth. Sunlight can make plants carry out photosynthesis, absorb carbon dioxide to produce glucose and oxygen, and slow down the greenhouse effect.
Sunlight panel is a good lighting material. When sunlight hits the panel directly, it can transmit light as high as 60%-85%. Usually made of PC/PVC/FRP.
The first ray of light in 2 1 century
At 6: 46 on June 65438+1 October1June 2000, when the first ray of sunshine just came out from the sea, cheers thundered from the seaside hills of Shitang Town, Wenling City, Zhejiang Province. Wang Yi, deputy director of the China 2000 Committee, also announced to the world in front of the Millennium Dawn Monument in China, Qianzhangya, Shitang: "The first ray of sunshine in the new millennium in Chinese mainland has reached Shitang, Wenling, Zhejiang!"
The role of sunlight
Sunlight on our skin will dilate blood vessels under the skin, increase blood flow, increase excretion and resistance to toxic substances, and also make saliva and stomach
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Increased secretion of body fluids, enhanced gastrointestinal peristalsis, and promoted appetite and digestion. When the skin is exposed to sunlight, it can also make vitamin D from some chemicals, such as ergot and cholesterol. This vitamin D, calcium and phosphorus are important components of our bones. Without them, we would get rickets.
Sunshine is more important for children, because they are growing and developing rapidly, and the development of bones plays an important supporting role for the whole body. Once the lack of sunlight makes body form vitamin D, the child's development will definitely have serious problems.
If vitamin D and calcium, phosphorus and other substances are lacking for a long time, pregnant women are prone to get osteomalacia. This disease is a very serious complication of pregnant women because of nutritional deficiency caused by vigorous metabolism of the body.
Sunbathing can restore and maintain the health of miners who have worked underground for a long time, so sunbathing once became a fashion. Ultraviolet rays in the sun have strong bactericidal ability. Generally, bacteria and some viruses will be killed if they are exposed to the sun for half an hour or several hours. Bring light. The sun is very important to human beings. The circulation of the earth's atmosphere, the alternation of day and night with the four seasons, and the changes of the earth's temperature and warmth are all the results of the sun. For astronomers, the sun is the only star that can observe the surface details.