MHT CET 2022 Physics question

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

(A)All Particles vibrate in phase.
(B)Particles between two consecutive antinodes vibrate in phase.
(C)The particles at alternate antinodes vibrate in phase.Correct
(D)The particles at all antinodes vibrate in phase.

Answer: (C)

Solution

In a stationary wave all particles between two consecutive nodes (i.e. within one loop) vibrate in phase, while particles in adjacent loops vibrate in opposite phase (phase difference ). Antinodes of adjacent loops therefore oscillate in antiphase, and antinodes that are two loops apart (alternate

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Question ID VK-093464