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Page "Interference (wave propagation)" ¶ 3
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If and crest
If a crest of a wave meets a crest of another wave of the same frequency at the same point, then the magnitude of the displacement is the sum of the individual magnitudes this is constructive interference.
If the first part of a tsunami to reach land is a trough — called a drawback — rather than a wave crest, the water along the shoreline recedes dramatically, exposing normally submerged areas.
If measured along the jagged lip of the falls, the crest is about long.
If intakes and outlets are submerged, a vacuum pump may be applied at the crest to prime the siphon.
If the temperature at the crest of the wave drops to the dew point, moisture in the air may condense to form lenticular clouds.
If any battery can no longer effectively stop the enemy from its present position, it will at once move forward to a position on the crest, to engage the enemy over open sights.
If the roll of the antihelix and its crest are effaced and flat, rather than rolled or folded, the steep pitch of the conchal wall continues into the un-formed antihelix and scapha and ends at the helix, with little interruption.
If an African civet feels threatened, it raises its dorsal crest to make itself look larger and thus more formidable and dangerous to attack.
If the Ship has no crest, or the individual works above the Ship level, the generic Sea Scout emblem is worn.
If possible, it will reverse away from a crest, and try to find a route forward through the relative safety of hidden low ground ( dead ground ).
If crossing a long crest is unavoidable, the vehicle will first back down and jockey at least 50 metres across the covered back of the slope, before advancing over the crest at high speed.
If the shape of the crest and carefully delineated wings and chest, prove the figure to be the domesticated dove, then it was being raised in Europe 4500 years ago, much earlier than we commonly think.
If the hatchment be for a married man, with a surviving wife, his arms upon a shield impale those of his wife ; or if she be an heraldic heiress they are placed upon an escutcheon of pretence, and crest and other appendages are added.
If, as is commonly illustrated, a skin frill extended from the crest to the neck or back, the proposed visual display would have been even showier.
If the unit is active Army and has war / campaign service, a crest is also authorized.
If heavy rain falls during high-tide, the crest gates remain closed and giant drainage pumps are activated to pump excess water out to sea.

If and one
If you take the one, you'd better take both ''.
`` If you can conveniently let me have twenty dollars '', he wrote one friend in 1791 when he was Secretary of the Treasury.
If one dancer slaps another, the victim may do a pirouette, sit down, or offer his assailant a fork and spoon.
If a child had a single drop of Negro blood, he would revert to the ancestral line which, except as slaves under a superior race, had not made one step of progress in 3,000 years.
If we examine the three types of change from the point of view of their internal structure we find an additional profound difference between the third and the first two, one that accounts for the notable difference between the responses they evoke.
If in any one calculation Ptolemy had had to invoke 83 epicycles all at once, while Copernicus never required more than one third this number, then ( in the sense obvious to Margenau ) Ptolemaic astronomy would be simpler than Copernican.
If within one year you can make a success out of the American, you can practically name your own salary thereafter.
If it is not one of his best books, it can only be considered unsatisfactory when compared with his own Garibaldi.
If one finger is raised against the authorities, all our moral power will vanish.
If any one of them has any power to veto the Secretary General's decisions the nature of the organization will have changed.
If he can bounce back with one of those 25 home runs years, the club will have to be better off offensively.
If they do meet and recognize one another, slap backs and embrace, the moment soon is done.
If either one ever started making promises, there is no telling where the promises would end.
If one follows the reports of the Congress, one finds that there still seems considerable uncertainty in the minds of the leaders themselves about what exactly to do in this matter.
Somebody, got to be somebody If I don't put my two cents in soon, somebody else will I know they're waitin only for one thing: for the bastards what done it to be nailed.
If we had, then one of us would have had to go instead.
`` If I catch you one more time down here without stockings '' --
If, for some reason such as economy, we are not going to develop aircraft nuclear propulsion with a sense of national urgency, then we should turn our effort to developing jet engines with a thrust-to-weight ratio of 12 or 15 to one.
If you don't own a planer and don't want to buy one, it's well worth renting.
Note: If 1/2-inch panel board is used inside and out, or 5/8-inch one side and 3/8-inch the other, and 1/8-inch glass is used, stock lumber in Af, Af, and Af can be used in making the glass panels.
If you have a full-time doctor now, can he be replaced with a part-time doctor or one who serves on a fee-per-case basis only??
If you use one of the new year-round cooling system fluids such as `` Dowguard '' be sure to check it.
If you run into excess plug fouling on one truck, check to be sure that the rig has a thermostat.

If and wave
If the wave function is regarded as ontologically real, and collapse is entirely rejected, a many worlds theory results.
If wave function collapse is regarded as ontologically real as well, an objective collapse theory is obtained.
If we take the simple valence bond structure and mix in all possible covalent and ionic structures arising from a particular set of atomic orbitals, we reach what is called the full configuration interaction wave function.
If a ray tracing is then made as if a light wave ( as understood in classical physics ) is wide enough to take both paths, then that ray tracing will accurately predict the appearance of maxima and minima on the detector screen when many particles pass through the apparatus and gradually " paint " the expected interference pattern.
* If the molecule has some symmetry, the degenerate atomic orbitals ( with the same atomic energy ) are grouped in linear combinations ( called symmetry-adapted atomic orbitals ( SO )), which belong to the representation of the symmetry group, so the wave functions that describe the group are known as symmetry-adapted linear combinations ( SALC ).
* If a storm or wave capsizes a small monohull, it may recover when the weight of the ballast in the keel rights the boat, if it does not broach and sink before it recovers.
If the pump waves and the signal wave are superimposed in a medium with a non-zero χ < sup >( 3 )</ sup >, this produces a nonlinear polarization field:
If two waves of the same wavelength and frequency are in phase, both the wave crests and wave troughs align.
If E < sub > i </ sub > is a sine wave, triangular wave, or wave of any other shape that is symmetrical around zero, the zero-crossing detector's output will be square.
If one knows the corresponding wave function at the instant before the measurement, one will be able to compute the probability of the wavefunction collapsing into each of the possible eigenstates.
If the wavelength is much shorter than the target's size, the wave will bounce off in a way similar to the way light is reflected by a mirror.
If an electron of energy E is incident upon an energy barrier of height U ( z ), the electron wave function is a traveling wave solution,
If a plane wave, confined to the xz plane, is incident on a dielectric with an angle and wavevector then a transmitted ray will be created with a corresponding angle of transmittance as shown in Fig.
If a traveling wave has a fixed shape that repeats in space or in time, it is a periodic wave.
If all the parts making up a medium were rigidly bound, then they would all vibrate as one, with no delay in the transmission of the vibration and therefore no wave motion.

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