The speed of {HEAD ~ propagation} is predetermined by {TAIL ~ the inherent characteristics} of the wave and the medium chosen 
The speed of { HEAD ~ propagation } is predetermined by { TAIL ~ the inherent characteristics } of the wave and the medium chosen
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH