sound waves you have to hear this!!!! producing a sound wave like all waves, sound waves are...
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Sound WavesSound Waves
You Have to Hear This!!!!You Have to Hear This!!!!
Producing a Sound WaveProducing a Sound Wave
Like all waves, sound waves are produced by a vibration.
A tuning fork vibrates to produce a sound.A guitar string vibrates to produce a sound.Your vocal cords vibrate to produce a sound.A tree that falls in the woods causes a vibration and produces a sound– even if no one is around to hear it!!!!!!!
Properties of Sound Properties of Sound WavesWaves
Sound Waves are Longitudinal Waves.
As the fork moves forward and back it alternately compresses and then
decompresses the air (or whatever medium it is traveling through).
From above the source it looks more like this:
Properties of Sound Properties of Sound WavesWaves
Sound Waves are Mechanical Waves
This means they MUST have a medium (matter) to travel.
This means sound waves CANNOT travel through empty space ( a
vacuum).
Properties of Sound Properties of Sound WavesWaves
All sound travels at the same speed in the same medium.
This speed is called the speed of sound.
The speed of sound in air is : 343 m/s (767 mph)The speed of sound in water: 1433 m/s (3206
mph)The speed of sound in concrete: 3400 m/s (7606
mph)The speed of sound in steel: 6100 m/s (13645
mph)
Properties of Sound Properties of Sound WavesWaves
The speed of sound is also affected by temperature.
Basically, the higher the temperature the faster sound travels.
As an equation this looks like this:
vsound = 331 + 0.6Tc
The Doppler EffectThe Doppler Effect
Whenever a source of sound is moving, the pitch you hear depends on whether the
sound source is moving towards you or away from you.