In a stationary wave, all the particles

In a stationary wave, all the particles
  1. on either side of a node vibrate in same phase
  2. in the region between two nodes vibrate in same phase
  3. in the region between two antinodes vibrate in same phase
  4. of the medium vibrate in same phase

Solution

In a stationary wave, all the particles in one particular segment (i.e. between two nodes) vibrate in the same phase.

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