GGR100H1 Lecture Notes - Lecture 3: Tropopause, Ellipse, Solar Constant
Document Summary
Solar energy provides the energy that drives all the natural systems- sunlight- photosynthesis etc. The sun is typical of hundreds of billions in milky way galaxy. Around 6000 kelvin (k) degrees at its surface- high temperature and pressure causes nuclear fusion within the sun. Solar radiation- speed of light, includes spectrum of visible light, as well as infrared ultraviolet, radio waves, microwaves, x and gamma rays. Electromagnetic radiation is emitted by all matter above absolute 0 (-273 celsius)=0 k (0 degrees kelvin) The intensity of the radiation emitted by any object is determined by temperature, the hotter an object is the more intense the electromagnetic radiation it gives off will be. Q(is proportional to ) t to the power of 4 (stefan boltzmann law) q t^4 q=radiation intensity and t is temperature. Wavelength is the distance between two crests of the wave. Example : human skin -33 degrees, and surface area is 1. 8 meters square.
