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Explain why the wavelength would represent two notes that sound terrible together.

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Answer:

Sounds that are perceived as unpleasant when played together are termed dissonant. The interference of acoustic waves contributes to this dissonance. In an octave, the higher-pitched note has a wavelength that is half as long as the lower note. In the context of scales, envision each note as a Lego brick.

Explanation:

User LauWM
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Notes that sound "bad" together are said to be dissonant. The dissonance is caused by the acoustic waves interfering with each other. ... On the interval of an octave, the note with higher pitch has a wavelength that is half as long as the lower note. As for scales, think of the individual notes as Lego bricks.
User Yoyoma
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