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 ?
If you don't think they are beatable you shouldn't be playing.
We know we are the underdogs and they are the favourites, but they are definitely beatable.
Black Caps pacer Chris Martin was quoted by the Sydney Morning Herald as saying that Australia were finally beatable without Warne and McGrath, citing the side's inability to dismiss India in the failed Test series.
Celtic have proved United are beatable every team is beatable if you do what you are told, work hard for your team-mates and put your chances away.
Barnsley, who sit 21st in the table, are surely beatable, even away from home, as we make a steady climb towards the top six.
He said: "We know this team is beatable, and it is just a matter of getting everything in place.
Out of the Blues' four remaining opponents, the Londoners are the ones nearest the bottom of the table and look the most beatable Their manager will remind them that they are not mathematically safe from relegation, but really it's looking like three from Palace, West Brom, Norwich and Southampton.
Freddie's popularity in the house is increasing, and if he is not nominated for the first time in the series Marcus could be up against a beatable poll opponent, such as 5-2 second favourite Lisa.
Brawley, 20, has yet to lose a round in winning all six of his pro contests and he reckons he could take Bolton's lightweight prospect He said: "Amir's been good for boxing but I don't think he's as good as he's made out to be and is definitely beatable.
Chasetown are very useful as their FA Cup exploits emphasise but are beatable.
The England hooker, the 18st 11lbs central axis of the biggest front row in world rugby, has this message for the doubters: "They're beatable.