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 ?
Professional soccer, basketball, and baseball players are joining together to publicize the dangers of dehydration and heat illness just as the summer heat begins to beat down on children and teens playing sports.
As the sun beat down at the Tees Barrage, the group of around 40 had a great day out and enjoyed a slap-up barbecue.
Suppliers believe the OEM in such a case is simply using the auction as a club to beat down its incumbent supplier on price; the auction wasn't run to find better suppliers, they contend.
AS the rain beat down in Gwynedd, the site of the Faenol Festival was turned into a mudbath.
(Think of how outraged whites were after Seattle police beat down dozens of middle-class, predominately white protesters at the World Trade Organization conference in early 2000.) In all, Nelson has put together a thoughtful, timely examination of a problem that the public must force to get better.
Kassima soothes her wounds with the ancient sorrow songs "about people beat down so low they got to pray for a reason to pray."
It was an unusually warm day; the sun beat down on the black playground asphalt with a mysterious heat that percolated the blood in our bodies and made even the most gentle among us surly and disagreeable.
But when the July rains finally begin to beat down, the desert reawakens to release its hidden bounty.
Stats: All-Ireland titles: 0 Leinster titles: 1 (1968) Manager: Dennis Connerton Star Man: Robbie Smyth (above) Last year: Lost to Offaly but beat Down and shocked Monaghan before Cork ended their run Leinster odds: 300/1 All-Ireland: 1000/1