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In a standing wave on a string rigidly fixed at both ends:
\( \mathrm{P} \)
(1) all the particles must be at their positive
W extremes simultaneously once in half of the time period.
(2) all the particles must be at their positive extremes simultaneously once in a time period.
(3) in one time period all the particles are simultaneously at rest twice.
(4) all the particle are never at rest simultaneously.
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