Under What Conditions Do Shock Waves Occur

Multiple Choice

Under what conditions do shock waves occur?

A) The frequency of the waves is the resonant frequency of the system.
B) The amplitude of waves exceeds the critical shock value.
C) When two waves from different sources collide with each other.
D) The wave source is traveling at a speed greater than the wave speed.
E) The period of the waves matches the lifetime of the waves.