explain each and every point.
Ultraviolet (UV), visible, and infrared (IR) light are segments of the electromagnetic spectrum. The spectrum is defined by wavelengths, which are often measured by nanometers (a billionth of a meter–so pretty tiny).
Ultraviolet is the shortest, most energetic of the three (though gamma rays and x-rays are both shorter and more powerful). Next comes the visible portion of the spectrum, which is light that we can see: colored light, going from violet, blue, green, yellow, orange and red. Right after visible light is infrared energy.
Spectroscopy is a form of remote sensing, which uses these wavelengths of light/energy to collect data from afar. Remote sensing satellites and technologies can record the amounts of energy that are absorbed, reflected, or transmitted from the earth’s surface or from other objects in space. Different materials do different things with energy: water absorbs most of it, so there will be little feedback to the satellite. Grasses are more reflective than trees, and even different species of trees can have distinct spectral signatures. This study, for example, looked at different species in Costa Rican rainforest.
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