... wavelengths (the very high energy gamma rays) to wavlengths of kilometers or more (radiowaves) Electromagnetic radiation The source of heat energy for the earth and atmosphere is ultimately electromagnetic radiation from the Sun. Electromagnetic radiation can be thought of as consisting of waves, with a given wavelength For the radiation of interest to us, wavelengths are usually measured in microns .There is ... within the electromagnetic spectrum that the eye responds to. Although radiation of longer or shorter wavelengths are present, the human eye is not capable of responding to it. ...

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• Grade Level: Undergraduate