Click here to see the latest start time for this test. The TSI Assessment is a college readiness test delivered through the Accuplacer system, specifically designed by the College Board to meet the requirements set forth by the Texas Legislature and the Texas Higher Education Coordinating Board (THECB).
7.2 The spectrum of the sun Visible light and infrared radiation constitute the major fraction of solar radiation reaching the atmosphere of the Earth (Fig. 7-1). Approximately 40 % of the radiation energy is visible light of wavelengths between 400 and 700 nm.. Visible Light and UV Radiation 75 Effects of the ozone layer Ozone, O 3, is produced when oxygen, O 2, in the upper atmosphere absorbs UVC (Î»). This absorption completely eliminates UVC from the solar radiation and dissociates oxygen molecules to oxygen atoms.
While the sun does emit ultraviolet radiation, the majority of solar energy comes in the form of light and heat, in the visible and infrared regions of the electromagnetic spectrum. As shown in Table 2, visible light spans the relatively narrow range of 0.4 to 0.9 Âµm (or 400 to 700 nm).