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Consonance is a pleasant set of pitches while a dissonance is an unpleasant one.

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A higher frequency sound has a higher pitch, and a lower frequency sound has a lower pitch

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The primary colors of light differ from paint. They make white when combined, not dirty brown.

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A larger amplitude means a louder sound, and a smaller amplitude means a softer sound

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Reflection is when waves, bounce from a surface back toward the source.

Refraction is when waves, are deflected when the waves go through a substance. The wave generally changes the angle of its general direction.

Diffraction is a characteristic of waves of all types. We can hear around a corner because of the diffraction of sound waves.

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Sound waves are a pressure variation transmitted through matter as a longitudinal wave

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Sound waves move through air or other materials. It does not travel in a vacuum

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Sound waves are longitudinal waves that go between compressions and rarefaction. A mnemonic would be to remember that LONGitudinal waves are LONG, not wavy.