Sound Waves
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Sound energy
Vibrates particles, vibrations pass through particles
Amplitude
Max distance travelled by particles compared to position at rest Higher amplitude=louder voice Greater amplitude=more energy
Longitudal (compression & refraction)
Size of area of compression
Wavelength
The length of the waves complete cycle
Frequency + rule
of cycles per unit of time measures in hertz (Hz) F= # cycles , seconds
If the frequency goes up the wavelength…
Is smaller
Mechanical wave + ex
Need a medium to travel through Ex: sound,water, seismic waves
Electromagnetic+ex
Waves that can travel through vacuum or a medium Ex: radio, light, x ray
Sound waves (3)
Longitudal waves that are mechanical Produced by vibration of object Vibrations are transmitted and can move through objects
Speed travels more in mediums with…..
More particles
Sound intensity (Db) Measured in factors of…
10 1db- 1x louder 10db- 10x louder 20db- 100x louder 30db- 1000x louder
Hearing damage occurs when you hear…
Ringing sounds in your ears
Sound frequency
Called a: pitch (high or low) Humans hear 20-20,000hz
Infrasound
Lower than 20hz
Ultrasound
Higher than 20,000hz