Two waves {standing wave} can travel in opposite directions from point and then reflect back from end barriers, so they reinforce each other {resonance, wave}| when they meet again, because they are in phase.
node
Resonating waves are stationary. In stationary waves, some points {node, wave} always have zero displacement.
wavelength
Fundamental standing-wave wavelength is two times distance between endpoints. Closed tubes have resonant wavelength one-quarter tube length. Open tubes have resonant wavelength one-half tube length. String resonant frequency is lower if string length is longer.
Systems can have standing waves {fundamental wave}| with lowest frequency.
Waves {harmonic wave, physics}| {overtone} can have frequencies that are fundamental-frequency multiples.
Waves can have frequency fundamental frequency times two {octave, wave}|, three {twelfth}, four {fifteenth}, five {seventeenth}, six {nineteenth}, and so on. Higher frequencies must have more energy to have significant amplitude.
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Date Modified: 2022.0225