3 ms·Even rarefaction obeys the speed of light. :)by reikonomusha 10y agoEven rarefaction obeys the speed of light. :)andygates 10y agoBut does hype?50CNT 10y agoIf it doesn't, we could use it to send messages back in time. Isn't that exiting?throwanem 10y agoI used to think so.ovi256 10y agoSpeed of sound in the respective medium, actually. EM interactions obey speed of light, mechanical interactions obey the speed of sound.