Wave
Wave kan jedhamu jeqamu space fi yeroo kessa darbuu, kan yeroo heduu daddarbu energy qabuu dha. Wavonni "mechanical" ta'aan daddarba (medium) barbaduu, daddarban kuniis ergaa waviin kessa darbee bodaa "elastic restoring force" basuu ni danda'a. Wavonni electromagnetic radiation garuu daddarba malee ademuu ni danda'uu, fakenya: gravitational radiation kan jedhamu vacuum kessaa darbuu ni danda'a. Wavonni energy bakka tokko bakka biratti gesuu fi daddabarsuu ni danda'uu, kanaas kan godhaan daddarba (medium) kessaa partikilotnii diquumma tokko yokaan hommaa osoo hin chocho'iin kessaa darbuun. Kanaaf jabenii (mass) tokkoleen ademsaa hin godhuu jechuu dha. Haa ta'u malee Waves travel and transfer energy from one point to another, often with little or no permanent displacement of the particles of the medium (that is, with little or no associated mass transport); instead there are oscillations around almost fixed positions.