Dab tsi yog hom hluav taws xob hluav taws xob hluav taws xob
Electromagnetic hluav taws xob, tseem hu ua hluav taws xob smog, yog tsim los ntawm lub zog hluav taws xob thiab lub zog sib nqus uas sib koom ua ke hauv qhov chaw, thiab lub zog no yog tsim los ntawm kev txav ntawm cov nqi hluav taws xob. Electromagnetic zog yog generated, piv txwv li, los ntawm mobile tsub nqi emitted los ntawm ib tug xov tooj cua zaus kav hlau txais xov uas yog kis ib tug teeb liab. Lub tshuab hluav taws xob "spectrum" suav nrog txhua hom hluav taws xob hluav taws xob, los ntawm cov hluav taws xob tsis tshua muaj hluav taws xob mus rau hluav taws xob hluav taws xob ntau heev. Kuj tseem muaj xov tooj cua tsis tau, microwaves, infrared, pom lub teeb, thiab ultraviolet lub teeb nyob nruab nrab. Lub ntsiab txhais ntawm lub xov tooj cua zaus ntawm lub electromagnetic spectrum hais txog hluav taws xob nrog zaus ntawm kwv yees li 3 kHz mus rau 300 GHz. Qee qhov hluav taws xob hluav taws xob muaj qee yam cuam tshuam rau tib neeg lub cev.
