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i want to know about beat frequency

i want to know about  beat frequency

Grade:11

2 Answers

Dastagir Hassain
33 Points
8 years ago

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.

Salim Shamim
37 Points
8 years ago

Freind, It''s Simple

Suppose a source A emits the sound of frequency K , and another source emits a frequency close to K say K-2, so when these sound waves superpose each other you get to hear a frequency K-(K-2)= 2 hertz, which is a result of constructive and destructive interference of two sound waves of slightly different frequency.

you can try out this on your pc by following this link.

http://upload.wikimedia.org/wikipedia/commons/6/6f/Terzosuono.ogg

 

here the beat frequency is increased gradually. 

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