For the young child this may be no more than providing food, light or movement.

For those who put their trust in Him He still says every day again: `` Let there be light ''!!

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 instance, a local society in the middle of a large city may have regular meetings with speakers, focusing less on observing the night sky if the membership is less able to observe due to factors such as light pollution.

For example, changes in signal strength may be used to specify the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels.

For instance, 202 obsolete Panzer I light tanks were modified by removing the turret and were rebuilt as the Panzerjäger I self-propelled Skoda anti-tank gun.

For example, PAC expression in certain neurons has been shown to alter the grooming behavior in fruit flies exposed to blue light.

For the simple case where the direction of the light beam along the line SE is perpendicular to the motion of the observer then only light emitted at an angle equal to the arc cosine of the ratio of the observer's speed to the speed of light will reach the telescope.

For its time, the game was considered " light years " ahead of the Original Dungeons & Dragons.

For Satan himself transforms himself into an angel of light.

* 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, the Diels-Alder reactions can be assisted by heat whereas the cycloaddition is selectively induced by light.

For example, the thermite reaction is used to generate light and heat in pyrotechnics and welding.

For identification by light microscopy, a scraping or swab of the affected area is placed on a microscope slide.

For example, diodes are used to regulate voltage ( Zener diodes ), to protect circuits from high voltage surges ( avalanche diodes ), to electronically tune radio and TV receivers ( varactor diodes ), to generate radio frequency oscillations ( tunnel diodes, Gunn diodes, IMPATT diodes ), and to produce light ( light emitting diodes ).

For light, we can often neglect one direction if the diffracting object extends in that direction over a distance far greater than the wavelength.

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 example, if a triangle is constructed out of three rays of light, then in general the interior angles do not add up to 180 degrees due to gravity.

For lower frequencies of EMR up to those of visible light ( i. e., radio, microwave, infrared ), the damage done to cells and also to many ordinary materials under such conditions is determined mainly by heating effects, and thus by the radiation power.

For instance, dark bands in the light emitted by a distant star are due to the atoms in the star's atmosphere.

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 an observer in back ( right ) of the car, each wave takes a slightly longer time to reach him than the previous wave.

For the case of a carrier modulated by a single sine wave, the resulting frequency spectrum can be calculated using Bessel functions of the first kind, as a function of the sideband number and the modulation index.

For s-polarization, a positive r or t means that the electric fields of the incoming and reflected or transmitted wave are parallel, while negative means anti-parallel.

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 continuous wave operation it is required for the population inversion of the gain medium to be continually replenished by a steady pump source.

For more complicated molecules, the wave mechanics approach loses utility in a qualitative understanding of bonding ( although is still necessary for a quantitative approach ).

For example, one can talk about motion of a wave or a quantum particle ( or any other field ) where the configuration consists of probabilities of occupying specific positions.

For example, in his 1997 book Numerology: Or What Pythagoras Wrought, mathematician Underwood Dudley uses the term to discuss practitioners of the Elliott wave principle of stock market analysis.

For instance, the behaviour of a light wave interacting with a metal surface is quite different from what happens when it interacts with a dielectric material.

For example, a single photon may be refracted by a lens or exhibit wave interference with itself, but also act as a particle giving a definite result when its position is measured.

For the production of electromagnetic radiation, there are many methods, depending upon the wave length ( see electromagnetic spectrum ).

For instance, in a hydrogen Maser, the well-known " 21cm wave " transition in atomic hydrogen, where the lone electron flips its spin state from parallel to the nuclear spin to antiparallel, can be used to create a population inversion because the parallel state has a magnetic moment and the antiparallel state does not.

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 such a component, any given phase of the wave ( for example, the crest ) will appear to travel at the phase velocity.

For example, the free particle in the previous example will usually have a wavefunction that is a wave packet centered around some mean position x < sub > 0 </ sub > ( neither an eigenstate of position nor of momentum ).

For example, a human voice can be sent as a radio wave or microwave by making the wave vary to correspond variations in the voice.

For example, if there are two waves that interact with each other we can add them which creates new odd looking wave.

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, in sinusoidal waves over deep water a particle in the water moves in a circle of the same diameter as the wave height, unrelated to wavelength.

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.