The sun has a radius of 7 × 108 m and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
GIVEN
• The sun approximates a blackbody
• Surface temperature (Ts) = 5800 K
• Radius (r) = 7 × 108 m
FIND
(a) The total rate of radiation from the sun (qr) (b) The radiation flux per square meter of surface area (qr/A)
PROPERTIES AND CONSTANTS
he Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
The rate of radiation from a blackbody,
The flux per square meter is given by
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