A guitar string fixed at both ends vibrates. Which outcome results when the excitation frequency precisely matches a resonant mode of the string?

💡 Explanation

When the excitation frequency matches a resonant mode, constructive interference occurs due to wave reflections at the fixed boundaries. This resonance leads to the formation of a standing wave with stable nodes and antinodes because the reflected waves reinforce each other. Therefore, a standing wave forms, rather than energy dissipating or waves canceling.

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