Even a rather thin layer ( relative to the wavelength ) of a dielectric will reduce the propagation velocity sufficiently below the speed of light, eliminating radiation loss from a surface wave along the surface of a long straight wire.
22.
The frequency of a sound is defined as the number of repetitions of its waveform per second, and is measured in hertz; frequency is inversely proportional to wavelength ( in a medium of uniform propagation velocity, such as sound in air ).
23.
Dynamic parallax has sometimes also been used to determine the distance to a supernova, when the optical wave front of the outburst is seen to propagate through the surrounding dust clouds at an apparent angular velocity, while its true propagation velocity is known to be the speed of light.
24.
These alternative forms can be derived by substituting wavelength with the ratio of propagation velocity ( c, approximately 3?0 ^ 8 m / s ) divided by frequency, and by inserting the proper conversion factors between km or miles and meters, and between MHz and ( 1 / sec ).
25.
The result is that a pulse of voltage is applied to the load with a duration equal to 2 " D " / " c " where " D " is the length of the line and " c " is the propagation velocity of the pulse in the line.
26.
In modern field theory, everything propagates at light speed, even " tachyons " . ( See this page, particularly the part about unit propagation velocity . ) In the wake of the OPERA paper I've heard people suggest that neutrinos could take a " talk ) 20 : 22, 29 September 2011 ( UTC)
27.
The mechanisms of acoustic radiation force generations include : ( 1 ) change in the density of energy of the propagating wave due to absorption and scattering; ( 2 ) reflection from inclusions, walls or other interfaces; and ( 3 ) spatial variations in propagation velocity, and ( 4 ) spatial variations of energy density in standing acoustic waves.
28.
Dimensions of the cranium or its structures are determined with the ultrasound time-of-the-flight technique that measures the transit time of an ultrasound wave and its ( potentially multiple ) echoes on their path through the cranium and calculates the corresponding distance ( s ) using known ultrasound propagation velocities in different tissues ( e . g . bone, brain, or fluid ).
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