Physics
Physics
Problem
When applied to two sources of waves, the term *coherent* means a. that they both have the same wavelength. b. that they both have the same amplitude. c. that they have a constant phase relationship. d. that they are both plane-polarised.Intuitive explanation
Coherence is about whether two wave sources vibrate in a predictable, stable relationship with each other. The key insight is that coherent sources maintain a constant phase difference—they're "in sync" in a way that lets their waves interfere constructively or destructively in a repeatable pattern. Without this phase relationship, interference patterns wash out and disappear.
Intuitive explanation
Coherence is about whether two wave sources vibrate in a predictable, stable relationship with each other. The key insight is that coherent sources maintain a constant phase difference—they're "in sync" in a way that lets their waves interfere constructively or destructively in a repeatable pattern. Without this phase relationship, interference patterns wash out and disappear.