IB Physics SL C.3.6 Coherence
IB Physics SL C.3.6 Coherence
Practise using wave diagrams to identify phase differences and explain why only coherent sources produce a stable interference pattern.
How this is tested
- state from a wave diagram whether points are in phase, pi/2 out of phase, or pi out, in rad or degrees
- explain that coherent sources keep a constant phase difference, so the fringe pattern stays fixed over time