[permalink] [id link]
For electromagnetic waves, this change in the angle of propagation is governed by Snell's law.
from
Wikipedia
Some Related Sentences
For and electromagnetic
For example, in sound recording, fluctuations in air pressure ( that is to say, sound ) strike the diaphragm of a microphone which induces corresponding fluctuations in the current produced by a coil in an electromagnetic microphone, or the voltage produced by a condensor microphone.
For example, in AC power lines, the waves of electromagnetic energy propagate through the space between the wires, moving from a source to a distant load, even though the electrons in the wires only move back and forth over a tiny distance.
* For some reactions, the presence of electromagnetic radiation, most notably ultraviolet light, is needed to promote the breaking of bonds to start the reaction.
For example, when electromagnetic radiation is absorbed by matter, particle-like properties will be more obvious when the average number of photons in the cube of the relevant wavelength is much smaller than 1.
For example, a system can emit energy to another by transferring ( radiating ) electromagnetic energy, but this creates forces upon the particles that absorb the radiation.
For contributions to the unification of the weak and electromagnetic interaction between elementary particles, Abdus Salam, Sheldon Glashow and Steven Weinberg were awarded the Nobel Prize in Physics in 1979.
For example, an explosion is the result of a chain reaction that transforms potential energy stored in chemical, mechanical, or nuclear form into kinetic energy, acoustic energy, and electromagnetic radiation.
For the production of electromagnetic radiation, there are many methods, depending upon the wave length ( see electromagnetic spectrum ).
For example, electromagnetic radiation is monitored for signs of transmissions from civilizations on other worlds.
For instance, our historical understanding about " sound ," " light " and " heat " have today been reduced to " wave compressions and rarefactions ," " electromagnetic waves ," and " molecular kinetic energy ," respectively.
For example, for an electromagnetic wave, if the box has ideal metal walls, the condition for nodes at the walls results because the metal walls cannot support a tangential electric field, forcing the wave to have zero amplitude at the wall.
For electromagnetic waves the speed in a medium is governed by its refractive index according to
For example, acoustics is distinguished from optics in that sound waves are related to a mechanical rather than an electromagnetic wave transfer caused by vibration.
For example, it is commonplace to make use of the argument that the group velocity of waves ( such as electromagnetic waves ) can not exceed the speed of light.
For example, the average power transmitted by an acoustic or electromagnetic wave or by an electrical signal is proportional to the square of the RMS amplitude ( and not, in general, to the square of the peak amplitude ).
For electromagnetic radiation, the amplitude of a photon corresponds to the changes in the electric field of the wave.
For example, the gravitational force between an electron and proton one meter apart is approximately 10 < sup >− 67 </ sup > newtons, while the electromagnetic force between the same two particles is approximately 10 < sup >− 28 </ sup > newtons.
For an electromagnetic wave, the coherence time is the time over which a propagating wave ( especially a laser or maser beam ) may be considered coherent.
For this reason, one speaks of " electromagnetism " or " electromagnetic fields ".
# For a telecommunications system, the spatial distribution of electromagnetic fields surrounding a given site.
For the electromagnetic field, the curvature form is an antisymmetric matrix whose elements are the electric field and magnetic field: the electromagnetic tensor.
For a propagating electromagnetic wave, such as a surface wave propagating along the surface of the Earth, these parameters vary with frequency and direction.
For and waves
: For amber waves of grain,
: For amber waves of grain,
For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.
For water waves, this is already the case ; water waves propagate only on the surface of the water.
For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted.
For waves which do not require a medium, such as light or gravity in general relativity, only the relative difference in velocity between the observer and the source needs to be considered.
For this reason, infrared, microwaves, and radio waves are thought to damage molecules and biological tissue only by bulk heating, not excitation from single photons of the radiation ( however, there does remain controversy about possible non-thermal biological damage from low frequency EM radiation, see below ).
For low-frequency radiation ( radio waves to visible light ) the best-understood effects are those due to radiation power alone, acting through the effect of simple heating when the radiation is absorbed by the cell.
For example, the sentence " The coat is red " has no observer, the sentence " We see the coat as red " ( where " we " indicates observers ) appears more specific in context as regards light waves and colour as determined by modern science, that is, colour results from a reaction in the human brain.
For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles per unit time.
For p-polarization, a positive r or t means that the magnetic fields of the waves are parallel, while negative means anti-parallel.
For example, if gravitational waves were observed to propagate slower than c ( the speed of light in a vacuum ), that would imply that the graviton has mass.
The red dot overtakes two green dots when moving from the left to the right of the figure. New waves seem to emerge at the back of a wave group, grow in amplitude until they are at the center of the group, and vanish at the wave group front. For surface gravity waves, the water particle velocities are much smaller than the phase velocity, in most cases.
For waves traveling through three dimensions, such as light waves, sound waves, and matter waves, the formulas for phase and group velocity are generalized in a straightforward way:
For who are so free as the sons of the waves?
For example, on the simplest of principles, one might expect to have standing waves in the extra compactified dimension ( s ).
For example, monohulls can power through waves that a multihull would be forced to ride over.
For and change
For this change is not a change from one positive position to another, but a change from order and truth to disorder and negation.
For change is dependent on the possibilities that individual men glimpse for the future.
For some white-collar workers it is a welcome change from the regular job, and a physical conditioner.
For all concerned with social-welfare legislation, the significance of this radical and revolutionary change in the thought and habits of the vast majority of the American people is clear, profound and far-reaching.
For if I knew the secret of letting this power in my body change directly into electricity, I could rent myself out to the electric companies and with just the power in my body I could light all the lights and run all the factories in the entire United States for some days.
-- For its final change of bill in its London season, the Leningrad State Kirov Ballet chose tonight to give one of those choreographic miscellanies known as a `` gala program '' at the Royal Opera House, Covent Garden.
For a 256-bit block, the first row is unchanged and the shifting for the second, third and fourth row is 1 byte, 3 bytes and 4 bytes respectively — this change only applies for the Rijndael cipher when used with a 256-bit block, as AES does not use 256-bit blocks.
For instance, a change in the declination of γ Draconis would be mirrored by an equal and opposite change to the declination of a star 180 degrees opposite in right ascension.
For example: as cultures change and the political environment shifts, societies may criminalise or decriminalise certain behaviours, which directly affects the statistical crime rates, influence the allocation of resources for the enforcement of laws, and ( re -) influence the general public opinion.
For example, when liquid water starts freezing, the phase change begins with small ice crystals that grow until they fuse, forming a polycrystalline structure.
For example, suppose that we want to compute the rate of change in atmospheric pressure ten seconds after the skydiver jumps.
For instance, because the 10 in the problem represents ten seconds, the expression f ′( 10 ) represents the change in pressure at a height of ten seconds, which is nonsense.
For example, Australian left-wing " true believers " levelled it at supporters of the failed republic referendum of 1999 ( where the vote was split not along conventional party lines but very much along socio-economic divides, with the rich overwhelmingly supporting the change while the less well-off were opposed – a superficially bizarre pattern for a non-economic issue ).
For example, in the political controversy over anthropogenic climate change that is prevalent in the United States-it has been thought that those who are opposed to the scientific consensus did so because of a lack of evidence.
For the most part, Cluster I consists of strains from the 1960s and 1970s, while Cluster II largely contains strains from the 1980s and 1990s, based on the change in the clone structure.
For example, during a war between Qi and Lu in 684 BC, the effect of drum on soldier's morale is employed to change the result of a major battle.
For example, an image may have areas of colour that do not change over several pixels ; instead of coding " red pixel, red pixel, ..." the data may be encoded as " 279 red pixels ".
For example, changes in the internal level do not affect application programs written using conceptual level interfaces, which saves substantial change work that would be needed otherwise.
; Security: For security reasons, it is desirable to limit who can see or change specific attributes or groups of attributes.
For example, each record in an " Employees ' Skills " table might contain an Employee ID, Employee Address, and Skill ; thus a change of address for a particular employee will potentially need to be applied to multiple records ( one for each of his skills ).
For example, chair does not change form between " the chair is here " ( subject ) and " I saw the chair " ( direct object ).
For example, Datura have the property of being able to change size of plant, size of leaf, and size of flowers, all depending on location.
0.206 seconds.