The Nature of Sound. Sound is Longitudinal  Longitudinal wave or compression wave  Compression vs. rarefaction  Longitudinal wave or compression wave.

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Presentation transcript:

The Nature of Sound

Sound is Longitudinal  Longitudinal wave or compression wave  Compression vs. rarefaction  Longitudinal wave or compression wave  Compression vs. rarefaction

How Sound is Produced  A vibration from a source (say a guitar string) sets the air molecules in motion  In some areas the air is compressed  And some areas it is spread out (rarefaction)  A vibration from a source (say a guitar string) sets the air molecules in motion  In some areas the air is compressed  And some areas it is spread out (rarefaction)

Sensing Pitch  The frequency of a sound wave is also known as pitch  Humans can sense sound waves with frequencies from 20 Hz to 20,0000 Hz  We hear sound because the vibrating air makes our ear drum vibrate and it sends signals to our brain.  The frequency of a sound wave is also known as pitch  Humans can sense sound waves with frequencies from 20 Hz to 20,0000 Hz  We hear sound because the vibrating air makes our ear drum vibrate and it sends signals to our brain.

Resonance  Drop a wrench and it clangs  The sound it makes is at its natural frequency  Resonance occurs when an object is forced to vibrate at its natural frequency.  Drop a wrench and it clangs  The sound it makes is at its natural frequency  Resonance occurs when an object is forced to vibrate at its natural frequency.

Tacoma Narrows Bridge