how sound is produced by a body
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Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. ... The human ear detects sound waves when vibrating air particles vibrate small parts within the ear.
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Given that 65% of the population are visual learners, using slides or other visual support during a presentation falls somewhere between being pretty useful and critically important. For the 65%, visual reinforcement enhances their ability to digest, process, and ultimately retain material.
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