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 ?
Rory Sabbatini will get another chance to see if Tiger Woods is really beatable in the Target World Challenge, on Dec.
When you get it all right, he is beatable," he added.
However, in the rugby universe, Italy have been proving that they're beatable in pretty much every Six Nations match they've played since being admitted to the tournament in 2000.
What's disappointing is that I think they are beatable when you put them under pressure, they react differently,' said Dallaglio, who was ruled out of the tour after suffering an ankle injury in the opening tour match against Bay of Plenty.
GABBY Agbonlahor is approaching Villa's Chelsea challenge tomorrow with a positive message for Alex McLeish and his players, declaring: "They are beatable.
Boss Mick Potter said: "Warrington can rattle up 60 points if you blink, but they are beatable, as a few teams have shown this season.
Sydney, Nov 24(ANI): West Indies fast bowler Jerome Taylor has said that the current Australian team is beatable.
They are most definitely beatable and I'll be backing Ireland to progress.
Portsmouth are beatable," said the former Sky Blues midfielder.
They look more beatable than they did in the last two seasons.
But I think his style would suit me and he's very beatable.
A website campaign has been launched to back South Shields MP, David Miliband, for the Labour leadership and show that Gordon Brown is beatable.