For energy density, there would be one less factor c; for intensity as stated in the problem it is OK as written. Intensity and energy density differ by a factor c/4.
See http://en.wikipedia.org/wiki/Planck%27s_law -- their formula has a factor 4pi less because I already included the solid angle factor.
in number 1, is that supposed to be 8*(pi)*h*c instead of 8*(pi)*h*c^2?
ReplyDeleteFor energy density, there would be one less factor c; for intensity as stated in the problem it is OK as written. Intensity and energy density differ by a factor c/4.
ReplyDeleteSee http://en.wikipedia.org/wiki/Planck%27s_law -- their formula has a factor 4pi less because I already included the solid angle factor.
thanks
ReplyDelete