|
Canada-0-Monuments ไดเรกทอรีที่ บริษัท
|
ข่าว บริษัท :
- 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 waves have properties such as frequency and wavelength that affect how we perceive them Frequency, measured in hertz, determines the pitch of the sound: higher frequencies mean higher pitches and lower frequencies mean lower pitches Wavelength, the distance between successive compressions or rarefactions, is inversely related to frequency
- 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
- 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
- Sound - Circular, Spherical, Waves | Britannica
Sound - Circular, Spherical, Waves: The above discussion of the propagation of sound waves begins with a simplifying assumption that the wave exists as a plane wave In most real cases, however, a wave originating at some source does not move in a straight line but expands in a series of spherical wavefronts The fundamental mechanism for this propagation is known as Huygens’ principle
|
|