The sun can be treated as a blackbody at temperature 5800 K, and solar radiation between...

The sun can be treated as a blackbody at temperature 5800 K, and solar radiation between the wavelengths 0.35 and 0.70 μm is useful for photosynthesis. (a)What is the wavelength λ1 below which 20% of the solar emission is concentrated? (b) What is the wavelength λ2 above which 20% of the solar emission is concentrated? (b) What fraction of total solar radiation is not useful for photo-synthesis?

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Amanda K answered 1 year ago

For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2100 K,...

For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2100 K, let Ic represent the intensity per unit wavelength according to the classical expression for the spectral radiancy and Ip represent the corresponding intensity per unit wavelength according to the Planck expression. What is the ratio Ic/Ip for a wavelength of (a) 400 nm (at the blue end of the visible spectrum) and (b) 210 μm (in the far infrared)? (c) Does the classical expression...

4. The sun approximates an ideal blackbody radiator at a temperature of 5825K. (a) By Wien’s...

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Consider the blackbody radiation emitted at a temperature of 500◦C. (i) Explain why a tungsten wire...

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From the solar constant and the average distance between the sun and the earth, estimate (a)...

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To a rough approximation, the Earth can be treated as a greybody sphere with uniform temperature,...

To a rough approximation, the Earth can be treated as a greybody sphere with uniform temperature, absorptance ? = 0.70 and emissivity ? = 0.61. The low absorptance is largely due to reflection of the incoming sunlight by clouds and ice, while the low emissivity is largely due to greenhouse gases in the atmosphere. Q1) Over timescales of decades, the total solar irradiance at the Earth varies between about 1360.3 W/m2 and 1362.0 W/m2 . Using the greybody Earth approximation,...

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The sun can be treated as a blackbody at temperature 5800 K, and solar radiation between...

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For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2100 K,...

4. The sun approximates an ideal blackbody radiator at a temperature of 5825K. (a) By Wien’s...

Consider the blackbody radiation emitted at a temperature of 500◦C. (i) Explain why a tungsten wire...

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