The region from 8 to 15 microns (µm) is referred to by Earth scientists as thermal infrared since these wavelengths are best for studying. Most plants depend on a mix of red and blue light. Red light plays a vital part in the growth of plants. However, we’ve already touched on one of the most important uses of red light. We find red represented in a vast number of different places in the world. This region of the spectrum is divided into near-, mid-, and far-infrared. Red has a wavelength between 650 and 700 nm. National Aeronautics and Space Administration. A remote control uses light waves just beyond the visible spectrum of lightinfrared light wavesto change channels on your TV. Light outside of this range may be visible to other organisms but cannot be perceived by the human eye. "Introduction to the Electromagnetic Spectrum" NASA Science. Light from 400700 nanometers (nm) is called visible light, or the visible spectrum because humans can see it. Retrieved, from NASA Science website: MLA Introduction to the Electromagnetic Spectrum. National Aeronautics and Space Administration, Science Mission Directorate. Top of Page | Next: Anatomy of an Electromagnetic Wave Instruments have to be positioned above Earth's energy-absorbing atmosphere to "see" higher energy and even some lower energy light sources such as quasars. This is a block of glass with a triangular cross section. White light can be split up to form a spectrum. While our atmosphere is essential to protecting life on Earth and keeping the planet habitable, it is not very helpful when it comes to studying sources of high-energy radiation in space. Dispersion of white light and the colours of the visible spectrum. These regions of the spectrum with wavelengths that can pass through the atmosphere are referred to as "atmospheric windows." Some microwaves can even pass through clouds, which make them the best wavelength for transmitting satellite communication signals. Some radiation, such as visible light, largely passes (is transmitted) through the atmosphere. Seeing Beyond our Atmosphere - NASAspacecraft, such as RHESSI, provide scientistswith a unique vantage point, helping them"see" at higher-energy wavelengths that areblocked by the Earth's protective atmosphere.Įlectromagnetic radiation is reflected or absorbed mainly by several gases in the Earth's atmosphere, among the most important being water vapor, carbon dioxide, and ozone.
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