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The characteristic of a sound wave that is directly related to the loudness of the sound is amplitude.

What is sound waves?

Sound wave is a type of wave that is produced by the vibration of objects which can be heard only if it's of high frequency.

The properties of sound waves include:

  • loudness or volume

  • amplitude,

  • quality.

The characteristic of a sound wave that is directly related to the loudness of the sound is amplitude. That is, a larger amplitude means a louder sound, and a smaller amplitude means a softer sound.

Learn more about waves here:

https://brainly.com/question/15663649

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