![]() Metal, wood, stone, glass, water, and many other substances conduct sound - many of them even better than air. Technically, sound is defined as a mechanical disturbance traveling through an elastic medium - a material that tends to return to its original condition after being deformed. Wavelength is the distance between any point on a wave and the corresponding point on the next wave. Ultrasound is sound with frequencies above the range of human hearing-that is, above 20,000 hertz. Sound quality distinguishes between notes of the same frequency and intensity that are produced by different musical instruments. Sound quality, also called timbre, is a characteristic of musical sounds. Sound medium is a substance in which sound waves travel. Resonance frequency is the frequency at which an object would vibrate naturally if disturbed. Rarefaction is a region in a sound wave in which the density of the sound medium is less than normal. Pitch is the degree of highness or lowness of a sound as we hear it. Noise is a sound that is unpleasant, annoying, and distracting. Loudness refers to how strong a sound seems when we hear it. Intensity of a sound is a measure of the power of its waves. One hertz equals one cycle (vibration, or sound wave) per second. Hertz is the unit used to measure frequency of sound waves. A 3,000-hertz tone of 0 dB is the softest sound that a normal human ear can hear.įrequency of a sound is the number of sound waves that pass a given point each second. Acoustics is the science of sound and of its effects on people.Ĭondensation is a region in a sound wave in which the sound medium is denser than normal.ĭecibel (dB) is the unit used to measure the intensity of a sound. ![]()
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