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Visible radiation is often ideal for observing hurricanes, clouds or, under clear conditions, many phenomena at the earth's surface.
It is essential for the experiments to be carried to the spectral distribution is the same as that of the sun, as a change in the spectral shape the relationship between the visible radiation (light), and radiation in the infrared and ultraviolet range.
By using echolocation, "which is three-dimensional, and makes it possible to 'see' through materials that are opaque to visible radiation," it is possible to measure the distance of an object based on the time that elapses between the emission of a sound wave and an echo being received of this wave as it is reflected from the object.