What is the phase difference between two successive crests in the wave

What is the difference between two successive homologs?

What is the phase difference between consecutive crest and through ?

What is the path difference between the two waves the crest of the wave falls on the trough of the other?

The wavelength of a travelling wave is 2 m. What is the phase difference between two particles 1 m apart.in the path of the wave.

What is the phase difference between two points on a wavefront?

What is the phase difference between two points on a wavefront ?

What is the phase difference between any two points on a wave front?