beat

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beat

1. Physics the low regular frequency produced by combining two sounds or electrical signals that have similar frequencies
2. Prosody the accent, stress, or ictus in a metrical foot
3. Nautical a course that steers a sailing vessel as close as possible to the direction from which the wind is blowing
4. 
a. the act of scouring for game by beating
b. the organized scouring of a particular woodland so as to rouse the game in it
c. the woodland where game is so roused
5. Fencing a sharp tap with one's blade on an opponent's blade to deflect it

Beat

A variation in the intensity of a composite wave which is formed from two distinct waves with different frequencies. Beats were first observed in sound waves, such as those produced by two tuning forks with different frequencies. Beats also can be produced by other waves. They can occur in the motion of two pendulums of different lengths and have been observed among the different-frequency phonons in a crystal lattice.

One important application of beat phenomena is to use one object with an accurately known frequency to determine the unknown frequency of another such object. The beat-frequency or heterodyne oscillator also operates by producing beats from two frequencies.

beat

[bēt]
(physics)
The periodic variation in amplitude of a wave that is the superposition of two simple harmonic waves of different frequencies.

beat

i. A low-frequency vibration produced when two sources of vibration act on the same object at the same time. For example, in a multiengine airplane, if two engines have slightly different RPM, airframe vibrations produced by these engines will produce a very noticeable beat.
ii. When two waves are combined or superimposed, a beat occurs if two frequencies are not the same. Waves beat together to create the appearance of either a change in amplitude, if the frequencies differ by a few hertz (Hz), or new frequencies, called beat frequencies or heterodynes, if the original frequencies are far apart.
References in periodicals archive ?
The USW beat back the potentially devastating effects of the cap on retirees by negotiating millions of dollars into a fund to cover retiree health care costs, and halted the company's drive for a two-tier system for new hires, who will remain on the same health care plan and participate in Alcoa's defined-benefit pension plan and not just a 401(k) plan.
Stenson wielded a Big Bertha(R) Fusion(R) FT-3(TM) Driver from Callaway Golf (NYSE:ELY) to help him subdue the winds and beat back an assault led by an assortment of similarly-armed Callaway Golf Staff Pros, including Nick Dougherty, Niclas Fasth and Ricardo Gonzalez, all of whom tied for fourth, and Thomas Bjorn, who tied for ninth.
Kudisch, who moved gracefully when in seduction mode, starts a frenzied final dance to beat back the darkness.
The Palestinian Authority has been in growing turmoil as Arafat tries to beat back demands for internal reform.
Will be hard to beat back over his optimum trip, writes Colin Russell.
NID Housing Counseling Agency of Oakland is teaming up with local community for an all-day educational event on Saturday, May 21, to help people learn how they can beat back the bad news to actually become homeowners.
With the White House now claiming that it was not treason, but rather "in the public interest" for President Bush to authorize Scooter Libby's leak of classified information to two reporters in an attempt to beat back criticism of the president's justification for war, I have just one question for the Leaker-in-Chief.
In the case of Clackamas County, we helped beat back a virus.
The bill passed 239-182 largely along party lines after Republicans beat back a last-ditch attempt by Democrats to scuttle it.
Passengers shrieked as the crew forced the door open and beat back the fire with an extinguisher.
From a technical perspective, resistance at the 53 level continues to beat back the shares.