1 The material is another important basis for computation of cost. 2  The material is usually computed by yard. 3  A couch on average uses from 18 to 22 yards of fabric. 4  Some fabrics cost as low as $15 per yard to as high as $180 for fabrics made of silk and wools. A couch on average uses from 18 to 22 yards of fabric. 2  Some fabrics cost as low as $15 per yard to as high as $180 for fabrics made of silk and wools. 3  Labor charges vary according to location and if the person doing it is a novice or professional for the job.
The major energy loss of high-energy (relativistic) electrons (energy greater than about 10 MeV, depending somewhat upon material) occurs from the emission of bremsstrahlung, and this is the major source of gamma rays in a high-energy cosmic-ray shower. See Electromagnetic radiation.
The continuous spectrum produced by a black body is distinctive and can be shown as an intensity plot of intensity against emitted wavelength. This plot is called the blackbody curve or the Planck curve, after the German physicist Max Planck who first postulated that electromagnetic radiation was quantised.