Topic 1 - displacement, phase difference, coherence, path difference

Question 1

displacement

Answer 1

distance and direction that the particle is from the equilibrium position

Question 2

phase difference

Answer 2

when a given point on a wave lags behind the exact same point on another wave

Question 3

radians

Answer 3

when the waves complete 1 wavelength its equivalent to an object moving in a circular path completing 360 degrees

360 = 2pie 
270 = 3/2pie
180 = 1pie
90 = pie/2

Question 4

Coherence

Answer 4

constant phase difference

coherent light consists of waves with the same frequency amplitude and phase

Question 5

Path difference

Answer 5

Differences in metres between the lengths of two points.