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If and unobstructed
If the receiver becomes open, or has an unobstructed path to the destination of a catch, he may then become the quarterback's target.

If and radio
* In the Tales of Old Dartmoor episode ( recorded in 1956 ) of The Goons radio comedy series, Grytpype-Thynne arranges for the prison to put to sea to visit the Château d ' If in France as part of a plan to find the treasure of the Count of Monte Cristo hid there.
If planets orbit the pulsar, they will cause slight anomalies in the timing of its observed radio pulses.
President Obama observed, " If media is operating basically as a talk radio format, then that's one thing, and if it's operating as a news outlet, then that's another ".
In the 1990s after a Motörhead show at Hultsfred, Sweden a radio reporter asked Lemmy " If you were to play here again in ten years, how do you think you would sound?
If the object is moving either toward or away from the transmitter, there is a slight equivalent change in the frequency of the radio waves, caused by the Doppler effect.
The debut single, " If It Makes You Happy ," became a radio success and netted her two Grammy awards for Best Female Rock Vocal Performance and Best Rock Album.
If this is typical, one way of discovering an extraterrestrial civilization might be to detect non-natural radio emissions from a location outside our Solar System.
If such an Interstellar Internet exists, the hypothesis states, communications between servers are mostly through narrow-band, highly directional radio or laser links.
If, instead of incorporating Einstein's clock synchronization ( lattice of clocks ), the astronaut ( outgoing and incoming ) and the Earth-based party regularly update each other on the status of their clocks by way of sending radio signals ( which travel at light speed ), then all parties will note an incremental build up of asymmetry in time-keeping, beginning at the " turn around " point.
If the radio wave frequency is decreased, a point is reached where all waves ( even vertically incident waves ) are reflected back to the Earth.
If a loss of radio communications were to be encountered during VFR conditions, or if VFR conditions are encountered after loss of communication with the ground and other aircraft, the pilot of the aircraft shall continue the flight under VFR and land as soon as practicable.
If the Earth were a perfect sphere and there were no atmosphere, the radio horizon would be a circle.
If a mayday call cannot be sent because a radio is not available a variety of other distress signals and calls for help can be used.
Roger Ebert wrote, " The DJ who was hosting the radio station's free preview of Cool World leaped onto the stage and promised the audience: ' If you liked Roger Rabbit, you'll love Cool World!
If radio waves strike an electrically conductive object of any size, they are slowed according to that object's permeability and permittivity.
In an interview on Detroit's WJR radio after his retirement, Anderson said he had told his wife that season, " If this is what the game has become, it don't need me no more.
* If the foreign audience is more than 1, 000 kilometers away from the broadcaster, shortwave radio is reliable, but subject to interruption by adverse solar / geomagnetic conditions.
If coming directly from the radio studio at a single station or television station, it is simply sent through the studio / transmitter link to the transmitter and hence from the television antenna located on the radio masts and towers out to the world.
If it is worn constantly, keeping it near body heat, its rate of drift can be measured with the radio, and by compensating for this drift, a navigator can keep time to better than a second per month.
If accurate, this would count numbers stations among the earliest radio broadcasts.
Although Burke ultimately won the chart war, Burke broke rank and supported his rival: “ I would go to the radio stations and say, ‘ Hi, I ’ m Solomon Burke, and I ’ m here promoting the new record “ If You Need Me ”… by Wilson Pickett .’” Despite his efforts, Burke's version jockeyed with Pickett's for position in the Hot 100, before " beating Pickett to the punch " because of " Solomon ’ s popularity and Atlantic ’ s distribution.
While also being included in " and Bioshock 2 " with the songs of " If I didn't care " and " The Best Things in Life are Free " while Bioshock 2 included " We Three ( My Echo, My Shadow and Me )"-Ink Spots and " I'm Making Believe "-The Ink Spots ; Ella Fitzgerald ," Memories of You "-The Ink Spots, " Someone's Rocking My Dreamboat "-The Ink Spots, while others were included in " LA Noire " on the radio stations.
If a signal is strong enough, not even a power source is needed ; building an unpowered crystal radio receiver was a common childhood project in the early decades of AM broadcasting.

If and waves
If the slowing down of certain seismic waves caused by the damp spot helped uncover the underground ocean, the unusual temperature variation with depth measured in 241 inactive oil wells helped locate the subterranean river.
If waves are emitted from an extended source, this can lead to incoherence in the transversal direction.
If the width of the slits is small enough ( less than the wavelength of the laser light ), the slits diffract the light into cylindrical waves.
If the waves are propagating through an anisotropic ( i. e., not rotationally symmetric ) medium, for example a crystal, then the phase velocity vector and group velocity vector may point in different directions.
If a spatial extra dimension is of radius R, the invariant mass of such standing waves would be M < sub > n </ sub > = nh / Rc with n an integer, h being Planck's constant and c the speed of light.
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 the pump beams E < sub > 1 </ sub > and E < sub > 2 </ sub > are plane ( counterpropagating ) waves, then:
If the pump waves are of frequency ω < sub > 1 </ sub >
If two waves of the same wavelength and frequency are in phase, both the wave crests and wave troughs align.
If two interacting waves meet at a point where they are in antiphase, then destructive interference will occur.
If electromagnetic waves traveling through one material meet another, having a very different dielectric constant or diamagnetic constant from the first,
If the diaphragm is placed on the patient, body sounds vibrate the diaphragm, creating acoustic pressure waves which travel up the tubing to the listener's ears.
If the bell is placed on the patient, the vibrations of the skin directly produce acoustic pressure waves traveling up to the listener's ears.
If a sound absorbing sheet is slid in between the prongs of a vibrating fork, reducing the waves reaching the ear from one prong, the volume heard will actually increase, due to a reduction of this cancellation.
If the waves have the correct frequency ( or wavelength ) and polarization, their energy can be transferred to the charged particles in the plasma, which in turn collide with other plasma particles, thus increasing the temperature of the bulk plasma.
If u is a superposition of such waves with weighting function φ, then
If scatterers are arranged symmetrically with a separation d, these spherical waves will be in sync ( add constructively ) only in directions where their path-length difference 2d sin θ equals an integer multiple of the wavelength λ.
If the distance between musicians is large enough, listeners may perceive waves to be out of phase.
If this depends on the polarization states of the waves, then their polarization may also be altered.
If the path length in the birefringent medium is sufficient, plane waves will exit the material with a significantly different propagation direction, due to refraction.
If mounted on a finite baffle, and these out of phase waves allowed to interact, dipole peaks and nulls in the frequency response result.

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