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What do we know about sound?
Where does it come from? 1.Vibrating bodies 2.Changing airflow 3.Time-dependent heat sources 4.Supersonic flow
How do we know it is there? 1. Biological receptors: –Pressure changes on eardrums, skin 2. Technical receptors: –microphone 3. Mechanical vibrations 4. Other indication (reactions of animals)
How do we characterize sound? 1. loudness loud, intense vs. soft, silent 2. pitch high pitched vs. low pitched bass vs. soprano 3. timbre or “color” warm, soft vs. shrill, piercing 4. duration
How does it get from the source to the receptor? Travels through a medium (gas, liquid, solid) “waves” Medium modifies the sound Distance changes loudness Motion of source or observer changes pitch.
Is there a place of absolute silence? Physiologically? Physically?
How will we be able to understand some of these observations? We will have to study some Physics fundamentals: Motion, force, pressure, energy, power, oscillations, waves, resonance, … Let’s go!
Sound is a form of energy. It comes from a vibrating source. Sound travels in invisible waves. Sound can travel through solids, liquids, and gases. Click.
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Sound waves carry information to your ears. Most people hear sounds between 20 hertz and 20,000 hertz. Sound waves are longitudinal waves— compressions.
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