(from http://www.explainthatstuff.com/sound.html)
". . . Sound is the energy things produce when they vibrate (move back and forth quickly). If you bang a drum, you make the tight skin vibrate at very high speed (it's so fast that you can't usually see it), forcing the air all around it to vibrate as well. As the air moves, it carries energy out from the drum in all directions. Eventually, even the air inside your ears starts vibrating—and that's when you begin to perceive the vibrating drum as a sound. In short, there are two different aspects to sound: there's a physical process that produces sound energy to start with and sends it shooting through the air, and there's a separate psychological process that happens inside our ears and brains, which convert the incoming sound energy into sensations we interpret as noises, speech, and music. . .
Sound is like light in some ways: it travels out from a definite source (such as an instrument or a noisy machine), just as light travels out from the Sun or a light bulb. But there are some very important differences between light and sound as well. We know light can travel through a vacuum because sunlight has to race through the vacuum of space to reach us on Earth. Sound, however, cannot travel through a vacuum: it always has to have something to travel through (known as a medium), such as air, water, glass, or metal. . ."
Space
(from Just More Music by Ray Jozwiak, ©2014 Raymond M. Jozwiak, coming in April 2015)
What do you think?
Tell me at
http://www.rayjozwiak.com/guestbook.html or at
http://www.ohomusic.com
OHO's "Ocean City Ditty," the CD single is now available at http://www.cdbaby.com/cd/oho4
(and, if you're in town, at Trax On Wax on Frederick Rd. in Catonsville, MD) OHO is Jay Graboski, David Reeve & Ray Jozwiak. Please Visit http://www.ohomusic.com
My latest solo offering, Just More Music by Ray Jozwiak, featuring original, instrumental piano music will be released April 7, 2014 Just More Music by Ray Jozwiak
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your browser: http://http://www.cdbaby.com/Artist/RayJozwiak)
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