In a standing wave on a string rigidly fixed at both ends:

  • A
    all the particles must be at their positive extremes simultaneously once in half of the time period.
  • B
    all the particles must be at their positive extremes simultaneously once in a time period.
  • C
    in one time period all the particles are simultaneously at rest twice.
  • D
    all the particles are never at rest simultaneously.

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