When the Sun becomes a red giant, it's luminosity will be 2000 times its current value. The solar flux at Earth will also increase by a factor of 2000. Neglecting the greenhouse effect, the surface temperature of the earth is determined by thermal equilibrium: the flux of radiation absorbed equals the flux of radiation emitted. This means the Earth's surface flux must also increase by a factor of 2000. If the current average surface temperature is 58 degrees F. what wil the average surface temperature be when the Sun is a red giant. [Hint: use the Stefan-Boltzman's law in the form of a ratio, and remember that the temperature there is in Kelvins.]

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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When the Sun becomes a red giant, it's luminosity will be 2000 times its current value. The solar
flux at Earth will also increase by a factor of 2000. Neglecting the greenhouse effect, the surface
temperature of the earth is determined by thermal equilibrium: the flux of radiation absorbed
equals the flux of radiation emitted. This means the Earth's surface flux must also increase by a
factor of 2000. If the current average surface temperature is 58 degrees F. what will the average
surface temperature be when the Sun is a red giant. [Hint: use the Stefan-Boltzman's law in the
form of a ratio, and remember that the temperature there is in Kelvins.]
Transcribed Image Text:When the Sun becomes a red giant, it's luminosity will be 2000 times its current value. The solar flux at Earth will also increase by a factor of 2000. Neglecting the greenhouse effect, the surface temperature of the earth is determined by thermal equilibrium: the flux of radiation absorbed equals the flux of radiation emitted. This means the Earth's surface flux must also increase by a factor of 2000. If the current average surface temperature is 58 degrees F. what will the average surface temperature be when the Sun is a red giant. [Hint: use the Stefan-Boltzman's law in the form of a ratio, and remember that the temperature there is in Kelvins.]
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