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The rayl is a unit of specific acoustic impedance, ... The rayleigh (R) is a unit of photon flux rate density equal to 10 10 m −2 ⋅s −1 (10 4 mm −2 ⋅s −1).
The rayl is also used for the characteristic (acoustic) impedance of a medium, which is an inherent property of a medium: [6] = Here, is the characteristic impedance, and and are the density and speed of sound in the unperturbed medium (i.e. when there are no sound waves travelling in it).
Rayleigh (unit), a unit of photon flux named after the 4th Baron Rayleigh; Rayl, rayl or Rayleigh, two units of specific acoustic impedance and characteristic acoustic impedance, named after the 3rd Baron Rayleigh; Rayleigh criterion in angular resolution; Rayleigh distribution; Rayleigh fading; Rayleigh law on low-field magnetization; Rayleigh ...
The distribution is named after Lord Rayleigh (/ ˈ r eɪ l i /). [1] A Rayleigh distribution is often observed when the overall magnitude of a vector in the plane is related to its directional components. One example where the Rayleigh distribution naturally arises is when wind velocity is analyzed in two dimensions.
NOTE 1 In the MKS system of units, 1 rayl is equal to 1 pascal per (meter per second). An acoustic impedance of 1 rayl results from the application of 1 pascal of sound pressure producing a particle velocity of magnitude 1 meter per second. NOTE 2 In the CGS system, 1 rayl is equal to 1 (dyn·s)/cm 3, which is equal to 10 rayls in the MKS. system.
In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection. [ 2 ] [ 3 ] [ 4 ] It characterises the fluid's flow regime: [ 5 ] a value in a certain lower range denotes laminar flow ; a value in a higher range ...
The rayleigh is a unit of photon flux, used to measure faint light emitted in the sky, such as airglow and auroras. It was first proposed in 1956 by Donald M. Hunten, Franklin E. Roach, and Joseph W. Chamberlain. [1] It is named for Robert Strutt, 4th Baron Rayleigh (1875–1947). [2] Its symbol is R (also used for the röntgen, an unrelated unit).
A type of surface waves are known as Rayleigh waves, and the elastic scattering of electromagnetic waves is called Rayleigh scattering. The rayl, a unit of specific acoustic impedance, is also named for him. Rayleigh was also awarded with (in chronological order): Smith's Prize (1864) Royal Medal (1882) Member of the American Philosophical ...