In Feynman's terms temperature is the speed at which atoms are 'jiggling'. Now, let's suppose I've just eaten a sizable dinner, and my body temperature just got a tad up. Am I emitting more photons in the infrared spectrum, or are my atoms 'jiggling' faster and bouncing more of the air component atoms (nitrogen, oxygen etc.)?
Or is it the same, and all heat energy transfer is mediated by photons?
Surely not all heat is mediated by the IR spectrum of the light? Otherwise only objects made of materials able to absorb IR photons energy levels would heat up?
Can't quite decide if it fits the scope of my question, but: where does heat reaching my skin from Sun come from? I plan to politely ignore answers 'from the Sun' :) I mean does it come from IR radiation?
And more generally: why is heat commonly attributed to IR spectrum? I take heat is a form of energy, if so, why doesn't my yellow car heat me up 'by it's photons' - visible spectrum is supposed to be of higher frequency = energy than IR?