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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.
Sound J.Sample Sound Sound is a form of energy produced and transmitted by vibrating matter. Sound must have a medium, (matter), to travel through.
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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Sound waves are longitudinal waves. When sound waves occur in air, air molecules press together and push apart. Based on what you know about longitudinal.
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Sound Waves Sound A form of energy that causes molecules of a medium to vibrate back and forth in a series of compressions and rarefactions as a longitudinal.
A sound is a wave and frequency determines pitch In your mind what is sound? Sound is an example of a mechanical wave and is produced by a vibrating object.
Sound Sound is a wave that carries vibrations. It is mechanical, longitudinal, and a pressure wave.
WAVES In Cornell Note Form. WAVES Waves transmit energy through matter or space by any disturbance of the matter matter – anything that has volume.
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Sources of Sound sound is a mechanical wave produced by vibrations that occur in a medium-- generally air sound is a longitudinal wave.
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A form of mechanical energy made by vibrations. When an object vibrates it causes the air particles around it to move. These particles bump into particles.
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