Question

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

Answer 1

Wavefront is the locus of all the particles of a medium that are found vibrating in the same phase, at a given instant.

The phase difference between any two points on a wave front is zero.

Irrespective of the nature of wave front, phase difference between any two points on wave front is defined in terms of RADIANS.

Answer 2

The phase difference between a node and its nearest antinode is π2π2 or 90 degrees. This can be seen by thinking of the wave as a simple sine function. There is a node at 0, then again at ππ, before the whole thing begins to repeat at 2π2π. The antinodes are half way between each pair of adjacent nodes, at π2π2, 3π23π2, etc.