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The Sun’s Light
Description: The light from the Sun is made up of many colours, called the visible spectrum and many shorter and longer wavelengths of light, collectively called the electromagnetic spectrum (see Figure 8). These other wavelengths are invisible to humans, but they can be measured with special detectors. These other wavelengths consist of Infrared (IR), Ultraviolet (UV), Micro, Radio, X, and Gamma. IR rays heat up matter. (IR light rays can be produced by specially modified light bulbs, and are used in many places that sell food.) Our atmosphere acts as an "infrared shield," and keeps this light from reaching the surface. UV light has become an increasing concern over the past few years. It is a form of radiation, and the hole in the ozone layer is allowing some of the normally blocked UV light to get through. UV light causes tans, sunburns, and skin cancer. Microwaves are put to use in most people's kitchens in the aptly named "microwave oven." They are used to heat foods quickly, and are more effective at doing so than IR. Radio waves are used in a whole branch of astronomy, for they can penetrate clouds of gas and dust that visible light can't. They are also used for transmitting radio and television shows, with television having a slightly higher frequency. X-rays are a form of radiation that are more powerful than UV, and are normally blocked by our atmosphere. X-rays are mainly used for medical purposes. Since they are a form of higher energy, they can penetrate denser objects than visible light can. Gamma rays are the most energetic form of radiation, and can pass through the human body. In cells, they can cause mutations and other severe damage. Luckily, they are blocked by our atmosphere. If they weren't, life as we know it, would be impossible Latest Video
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