the fraction of solar radiation reaching tge earth surface used for photosynthesis is in the range of
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The three relevant bands, or ranges, along the solar radiation spectrum are ultraviolet, visible (PAR), and infrared. Of the light that reaches Earth's surface, infrared radiation makes up 49.4% of while visible light provides 42.3% 9. Ultraviolet radiation makes up just over 8% of the total solar radiation.
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Solar radiation is radiant (electromagnetic) energy from the sun. It provides light and heat for the Earth and energy for photosynthesis. This radiant energy is necessary for the metabolism of the environment and its inhabitants 1. The three relevant bands, or ranges, along the solar radiation spectrum are ultraviolet, visible (PAR), and infrared. Of the light that reaches Earth’s surface, infrared radiation makes up 49.4% of while visible light provides 42.3% 9. Ultraviolet radiation makes up just over 8% of the total solar radiation. Each of these bands has a different impact on the environment.
Most of the solar radiation that reaches Earth is made up of visible and infrared light. Only a small amount of ultraviolet radiation reaches the surface.
Solar radiation is measured in wavelengths or frequency. As light travels in a wave, a wavelength is defined as the distance from peak to peak and is measured in nanometers (nm). Frequency is defined as wavelength cycles per second and is expressed in hertz (Hz). Bands with shorter wavelengths produce higher frequencies. Likewise, the longer the wavelength, the longer it will take to complete a cycle, which produces a lower frequency 1.
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