Izithando zokuthandwa yizingcezu ezibalulekile zemishini ezifemini zokucwenga igolide, ukudlala indima ebalulekile ekuncibilikeni nasekuhlanzweni kwezinsimbi eziyigugu. Ngokungeniswa kwe-electromagnetic, lezi zithando zikhiqiza ukushisa okusebenza kahle futhi okunembile, ukwenza kube ukukhetha okuhle ekucwengiseni igolide nezinye izinsimbi eziyigugu. Umnyombo wokusebenza kwesithando somlilo sokungeniswa yi-prin