Which property is common to both thermal radiation and visible light?

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

Which property is common to both thermal radiation and visible light? (a) Both require a material medium to propagate (b) Both can be polarized (c) Both necessarily travel at speeds less than 3×108 m s−13\times10^{8}\,\text{m\,s}^{-1} (d) Both are longitudinal waves

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