Usually involves feeling of fear or insecurity. The loss of confidence in things that have always been stable or dependable in the past â this includes things such as a relationship, your personality structure, health, etc; so the breakdown of opinions, attitudes or relationships which seemed so dependable and you have taken for granted.
Crests and troughs. Waves have moving crests (or peaks) and troughs. A crest is the highest point the medium rises to and a trough is the lowest point the medium sinks to. Crests and troughs on a transverse wave are shown in Figure 1. A crest is a point on the wave where the displacement of the medium is at a maximum.
Definition of 'shock wave'. shock wave also shockwave. A shock wave is an area of very high pressure moving through the air, earth, or water. It is caused by an explosion or an earthquake, or by an object travelling faster than sound. The shock waves yesterday were felt from Las Vegas to San Diego.