Two particles execute simple harmonic motion (SHM) of the same amplitude and frequency along the same straight line from the same mean position. What can be said about the phase difference between the two particles?
1) The phase difference between the two particles is always zero.
2) The phase difference between the two particles is always 180 degrees.
3) The phase difference between the two particles can be any value between 0 and 180 degrees.
4) The phase difference between the two particles depends on the amplitude and frequency of the SHM.