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(D) In a standing wave on a string fixed at both ends,the string is divided into segments called loops. Each loop is separated by nodes (points of zer

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The particles at all antinodes vibrate in phase.

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(D) In a standing wave on a string fixed at both ends,the string is divided into segments called loops. Each loop is separated by nodes (points of zero displacement). Within a single loop,all particles vibrate in phase with each other. Particles in adjacent loops are separated by a node and vibrate with a phase difference of $\pi$ radians (i.e.,they are in anti-phase). Therefore,particles in alternate loops (separated by an even number of nodes) vibrate in phase. Since each antinode is located at the center of a loop,the particles at all antinodes vibrate in phase with each other.

$A$ standing wave with a number of loops is produced on a string fixed at both ends. Which one of the following statements is correct?

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