Loudness, Refers to how soft or how instense a sound is., medium, solids, liquids, gases, pitch, how high or low the sound is, high pitch, high frequency & short wave length, low pitch, low frequency & long wave length, sound, a form of energy that travels as waves through matter, Oscilloscope, Instrument to measure loudness, mechanical wave, waves that require a medium to transfer energy, 0 - 20 dB, Human Hearing Range in Loudness.

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