CTPR 242 Fall '11 - Week 2

CTPR 242 Fall '11 - Week 2 - Likeapebbleinapond other , >...

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Like a pebble in a pond - Sound travels by molecules interacting with each  other. - Like the water of the pond, there is no net  movement  -> the molecules don’t move out of their nominal  positions. There are instantaneous air pressure  changes, but no overall change.
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A medium is necessary - Sound can’t travel in a vacuum. The interaction of  molecules is what causes sound to travel. - Because sound travels in this way, it can travel  around corners; this is known as diffraction . - 1130 ft/sec @ room temperature  (very slow relative to light) - Air molecules compress  and rarefact  in the presence  of sound. Think of it like striking a tuning fork…
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Sine Wave
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Sine Wave compression rarefaction Barometric  pressure w/o  sound
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I. Amplitude - Corresponds to the real-world quantity commonly  known as volume  or loudness . -
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This note was uploaded on 12/23/2011 for the course CTPR 242 taught by Professor Holman during the Fall '08 term at USC.

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CTPR 242 Fall '11 - Week 2 - Likeapebbleinapond other , >...

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