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Author: admin, 04.04.2014
Before you learn how sound equipment works it's very important to understand how sound waves work. The illustration on the left shows a speaker creating sound waves (click the button to show animation). Note that a waveform graph is two-dimensional but in the real world sound waves are three-dimensional.
The next thing to consider is what the graph represents; that is, what it means when the wave hits a high or low point. Note that air molecules do not actually travel from the loudspeaker to the ear (that would be wind).
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They are created by the vibration of an object, which causes the air surrounding it to vibrate. The graph indicates a wave traveling along a path from left to right, but real sound waves travel in an expanding sphere from the source.

The following explanation is a simplified way of looking at how sound waves work and how they are represented as a waveform. When this signal is converted to a sound wave, you can think of high values as representing areas of increased air pressure. As the loudspeaker vibrates, it causes the surrounding molecules to vibrate in a particular pattern represented by the waveform. Each individual molecule only moves a small distance as it vibrates, but it causes the adjacent molecules to vibrate in a rippling effect all the way to the ear.
As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages.Click here to learn more. The vibrating air then causes the human eardrum to vibrate, which the brain interprets as sound.
However the 2-dimensional model works fairly well when thinking about how sound travels from one place to another. When the waveform hits a high point, this corresponds to molecules of air being packed together densely.

The words are harp, drum, flute, violin, recorder, xylophone, trumpet, trombone, cymbals. Unscramble Musical Instrument WordsUnscramble the musical instruments, and then color the pictures of the words. The words are drum, trumpet, recorder, violin, xylophone, trombone, cymbals, guitar, harp, flute. Circle the Correctly-Spelled Musical InstrumentsCircle the correct spelling of musical instrument words, and then color the picture of the words. The words are drum, trumpet, recorder, violin, xylophone, trombone, cymbals, guitar, flute, harp. Musical Instruments Word Pieces PuzzleIn this puzzle, combine pairs of word segments to make musical instrument spelling words.
Print out a simple maracas coloring page or label the maracas and other percussion instruments. pianoA piano is a musical instrument with 88 keys.

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