(1) Where P (watts) is the radiated power from a body of area A (m2) at temperature T (K). Îµ is emissivity, a dimensionless number between 0 and 1 that determines the. efficiency of a body to radiate and absorb energy. A perfect radiator and absorber has an emissivity of 1. Soil, ice, rock, asphalt and human skin have emissivities slightly less than 1. Ï -8is the Stefan-Boltzmann constant, 5.67 x10 Wm-2T-4 T is the body temperature in Kelvin. So if absolute temperature (in Kelvin degrees) doubles, radiated power increases by a factor of sixteen. Also, changes in temperature alter radiation peak wavelengths. Temperature increases move peak radiation to smaller wavelengths and vice-versa. Equilibrium and Solid Angles
Martin Luther King was often seen wearing a gold Rolex DayDate at many of his speaking functions. Musician John Mayer is seen here wearing his Rolex Daytona. Talk show host Ellen DeGeneres also wears a Rolex Daytona. Actor Brad Pitt is often seen wearing a Rolex Explorer.
ellen degeneres tells time she s a lesbian i don t have to be fearful actress says april 6 1997 web posted at 11 08 p m edt 0308 gmt new york cnn saying she was speaking up for my own truth comedian and television star ellen degeneres said in an interview that she is a lesbiani always thought i could keep my personal life separate from my professional life degeneres 39 said in an interview in the latest issue of time magazinehe decision was finally made to have the character acknowledge she is a lesbian during the april 30 episode of the show when i decided to have my character on the show come out i knew i was going to have to come out too degeneres told time