Q.Does an ordinary electric lamp emit EM waves?

[!TLDR] Yes -- an ordinary electric lamp's filament is hot, and any hot body's charges undergo accelerated thermal motion, which radiates EM waves (mostly infrared, with some visible light). [!AN …

An ordinary electric (incandescent) lamp works by heating a filament until it glows. At the atomic level, heating a material means giving its charged particles (electrons, ions) additional random thermal motion, which includes acceleration; per section 13.2.1, any accelerated charge radiates EM waves. This is exactly why hot objects are described as a source of infrared radiation in section 13.3.3, and why the same lamp, once hot enough, also emits a portion of its radiation as visible light (which is what makes the lamp appear to glow). …

Connect the general source mechanism (accelerated charges radiate EM waves, section 13.2.1) to the specific case of a hot lamp filament, and …

Assuming a lamp emits only visible light because that is the only part we consciously see -- it in fact radiates a substantia …