A stationary wave is set up in a string whose two ends are attached to two rigid walls and a tension is maintained in the string. Then

• A

  phase difference between two particles of the string on both sides of a node is ${180}^o$

• B

  phase difference between two particles lying between two nodes is ${90}^o$

• C

  All particles lying between two nodes are vibrating with same amplitude.

• D

  all particles of the string pass through their equilibrium positions wit same velocity.