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  • Sound | Properties, Types, Facts | Britannica
    Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium A purely subjective, but unduly restrictive, definition of sound is also possible, as that which is perceived by the ear Learn more about the properties and types of sound in this article
  • How Does Sound Travel? | Waves, Speed, Frequency, Amplitude - Britannica
    Sound travels in waves that are essentially disturbances that move through a medium by causing particles to vibrate back and forth in the direction of the wave’s travel Imagine a Slinky toy or a coiled spring: when you pull back one end and release it, a wave of compression and expansion of the coils travels along its length Similarly, sound waves consist of alternating compressions and
  • Wave | Behavior, Definition, Types | Britannica
    wave, propagation of disturbances from place to place in a regular and organized way Most familiar are surface waves that travel on water, but sound, light, and the motion of subatomic particles all exhibit wavelike properties In the simplest waves, the disturbance oscillates periodically (see periodic motion) with a fixed frequency and
  • Sound - Standing Waves, Frequency, Wavelength | Britannica
    Sound - Standing Waves, Frequency, Wavelength: This section focuses on waves in bounded mediums—in particular, standing waves in such systems as stretched strings, air columns, and stretched membranes The principles discussed here are directly applicable to the operation of string and wind instruments When two identical waves move in opposite directions along a line, they form a standing
  • Sound - Decibel, Frequency, Amplitude | Britannica
    Sound - Decibel, Frequency, Amplitude: The ear mechanism is able to respond to both very small and very large pressure waves by virtue of being nonlinear; that is, it responds much more efficiently to sounds of very small amplitude than to sounds of very large amplitude Because of the enormous nonlinearity of the ear in sensing pressure waves, a nonlinear scale is convenient in describing the
  • Speed of sound | Description Examples | Britannica
    A sound wave thus consists of alternating compressions and rarefactions, or regions of high pressure and low pressure, moving at a certain speed Put another way, it consists of a periodic (that is, oscillating or vibrating) variation of pressure occurring around the equilibrium pressure prevailing at a particular time and place
  • Wave motion | Definition, Examples, Types, Facts | Britannica
    Wave motion, propagation of disturbances—that is, deviations from a state of rest or equilibrium—from place to place in a regular and organized way Most familiar are surface waves on water, but both sound and light travel as wavelike disturbances, and the motion of all subatomic particles exhibits
  • Shock wave | Definition Facts | Britannica
    Shock wave, strong pressure wave in any elastic medium such as air, water, or a solid substance, produced by phenomena that create violent changes in pressure Shock waves differ from sound waves in that the wave front is a region of sudden and violent change
  • Doppler effect | Definition, Example, Facts | Britannica
    Doppler effect, the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by relative motion of the observer and the wave source It was first described (1842) by the Austrian physicist Christian Doppler





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