This narrow band of visible light is affectionately known as ROYGBIV.Įach individual wavelength within the spectrum of visible light wavelengths is representative of a particular color. Expressed in more familiar units, the range of wavelengths extends from 7 x 10 -7 meter to 4 x 10 -7 meter. This visible light region consists of a spectrum of wavelengths that range from approximately 700 nanometers (abbreviated nm) to approximately 400 nm. In this sense, we are referring to visible light, a small spectrum from the enormous range of frequencies of electromagnetic radiation. Normally when we use the term "light," we are referring to a type of electromagnetic wave that stimulates the retina of our eyes. Since this narrow band of wavelengths is the means by which humans see, we refer to it as the visible light spectrum. Though electromagnetic waves exist in a vast range of wavelengths, our eyes are sensitive to only a very narrow band. The focus of Lesson 2 will be upon the visible light region - the very narrow band of wavelengths located to the right of the infrared region and to the left of the ultraviolet region. You are undoubtedly familiar with some of the other regions of the electromagnetic spectrum. Two very narrow regions within the spectrum are the visible light region and the X-ray region. The longer wavelength, lower frequency regions are located on the far left of the spectrum and the shorter wavelength, higher frequency regions are on the far right.
The diagram below depicts the electromagnetic spectrum and its various regions. The subdividing of the entire spectrum into smaller spectra is done mostly on the basis of how each region of electromagnetic waves interacts with matter. The entire range of the spectrum is often broken into specific regions. This continuous range of frequencies is known as the electromagnetic spectrum. Nonetheless, there are a variety of statements that can be made about such waves.Įlectromagnetic waves exist with an enormous range of frequencies. The precise nature of such electromagnetic waves is not discussed in The Physics Classroom Tutorial. Electromagnetic waves are produced by a vibrating electric charge and as such, they consist of both an electric and a magnetic component. Unlike mechanical waves that require a medium in order to transport their energy, electromagnetic waves are capable of transporting energy through the vacuum of outer space.
Electromagnetic radiation cannot be focused crack#
The direction of the magnetic flux density vector generated by rock Brazilian tests tends to be parallel to the crack surface.As discussed in Unit 10 of The Physics Classroom Tutorial, electromagnetic waves are waves that are capable of traveling through a vacuum. It is observed that the changing law of the direction angles is consistent, showing a strong correlation with the symmetrical position. Based on the obtained results, three indicators are proposed to characterize the directionality of the electromagnetic radiation generated by the rock fracture. The superposition effect of the electromagnetic field from microcrack initiation to macro-fracture is analyzed further. The experimental and theoretical results exhibit close resemblance. In the whole loading process, four sets of three-axis electromagnetic antennas are used for simultaneous measurement in different directions. Followed by this, the experimental investigations on limestone and shale under the condition of Brazilian tests are performed. Considering the electromagnetic field pattern generated by the oscillating dipole, the generation process of the electromagnetic radiation signal is divided into two stages namely, initiation of the forced oscillation of the dipole and the damped dipole oscillation. With this motive, based on the theory of fracture mechanics and electromagnetics, the nonlinear field at the crack tip and the atomic bond breaking condition are analyzed in this study. The electromagnetic radiation generated during the fracturing process is generally regarded as vector field that holds an imperative significance in rock engineering and fracture mechanics.
0 kommentar(er)
