Which three characteristics make iron a good blackbody radiator? A. It emits several different wavelengths of EMR.
B. It does not emit EMR when hot.
C. It absorbs much of the EMR it receives.
D. It changes color when exposed to EMR that heats it.

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp,max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?