a distant object is observed to be partially emitting in the frequency of 1.5x10E8 Hz and has a surface temperature of 3000k. Assuming that is object is a perfect black body, what is the spectral radiance of it in this frequency in W/Hz sr m^2

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?