![]() ![]() Wavelength of a radio wave is inversely proportional to its frequency, because its velocity is constant. At 30 Hz the corresponding wavelength is ~10,000 kilometers (6,200 miles), which is longer than the radius of the Earth. At 300 GHz, the corresponding wavelength is 1mm, which is shorter than the diameter of a grain of rice. Radio waves are a type of electromagnetic radiation with the longest wavelengths in the electromagnetic spectrum, typically with frequencies of 300 gigahertz ( GHz) and below. In this animation the action is shown slowed down tremendously. Loops of electric field leave the antenna and travel away at the speed of light these are the radio waves. The transmitter applies an alternating electric current to the rods, which charges them alternately positive (+) and negative (−). The antenna in the center is two vertical metal rods connected to a radio transmitter (not shown). Animation of a half-wave dipole antenna radiating radio waves, showing the electric field lines. For the British broadcasting station, see Radio Wave 96.5. For the electronics, see Radio frequency engineering. For the generic oscillation, see Radio frequency. Geophysics, 52, 11.This article is about the radiation. Diffraction tomography and multisource holography applied to seismic imaging. The perturbation method in elastic wave scattering. Attenuation of short period seismic waves due to scattering. Geophysical Journal International, 171, 865. Numerical simulation of wave propagation in fractured media: scattering attenuation at different stages of the growth of a fracture population. Geophysical Journal International, 152, 649. Numerical simulation of wave propagation in media with discrete distributions of fractures: effects of fracture sizes and spatial distributions. Bulletin of the Seismological Society of America, 81, 2234. Diffraction of P, SV, and Rayleigh waves by topographic features: a boundary integral formulation. Topographic effects for incident P, SV, and Rayleigh waves. Geophysical Journal International, 135, 289. Numerical modelling of seismic waves scattered by hydrofractures: application of the indirect boundary element method. Diffraction of seismic waves by cracks with application to hydraulic fracturing. Journal of Computational Acoustics, 9, 1039. Numerical study of elastic wave scattering by distributed cracks or cavities using the boundary integral method. Larose, E., Margerin, L., van Tiggelen, B. Journal of the Optical Society of America, 52, 116. ![]() Geophysical Journal International, 66, 221. The use of the Born approximation in seismic scattering problems. Bulletin of the Seismological Society of America, 68, 573. Numerical study of diffraction of plane elastic waves by a finite crack with application to location of a magma lens. Geophysical Journal International, 103, 111.įehler, M., and Aki, K., 1978. The effect on teleseismic P of the zone of damage created by an explosion. Journal of Geophysical Research, 94, 17805.ĭouglas, A., and Hudson, J. Numerical study of the diffraction of elastic waves by fluid-filled cracks. ![]() Finite-difference modelling of faults and fractures. The Journal of the Acoustical Society of America, 81, 1671.Ĭoates, R. Diffraction of elastic waves by cracks or cavities using the discrete wave-number method. London: Pitman Learning.īouchon, M., 1987. Ray Methods for Waves in Elastic Solids, with Application to Scattering by Cracks. ![]()
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