Stefan-Boltzman Law
E=sT^{4} where: E = total amount of radiation emitted by an object per square meter (Watts m^{-2}) s is a constant called the Stefan-Boltzman constant = 5.67 x 10^{-8} Watts m^{-2} K^{-4} T is the temperature of the object in K |
Consider the earth and sun: Sun: T = 6000 K so E = 5.67 x 10^{-8} Watts m^{-2} K^{-4} (6000 K)^{4} = 7.3 x 10^{7} Watts m^{-2} Q: is this a lot of radiation??? Compare to a 100 Watt light bulb..... Earth: T = 288K so E = 5.67 x 10^{-8} Watts m^{-2} K^{-4} (288 K)^{4} = 390 Watts m^{-2} Q: If you double the temperature of an object, how much more radiation will it emit? ANSWER |