By Rhett Price Speed of Sound Speed of sound depends on density Correlation between speed and density Not as fast as light speed Also affected by pressure and temperature Positive correlation between them ID: 326432
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Slide1
Sound Waves
By Rhett PriceSlide2
Speed of Sound Speed of sound depends on densityCorrelation between speed and density
Not as fast as light speedAlso affected by pressure and temperature
Positive correlation between themSlide3
WavelengthWave - simple energy through an object.
Top of wave called crestWavelength - Distance between crests.
Picture on bottom equals one wavelength
Wavelength correlates with frequency
Some wavelengths too short or long to hearSlide4
Frequency Frequency – Cycles within a set time.
Measured in hertz and kilohertz1kHz equals 1,000 Hz.
Speed = frequency x wavelength.
Vibrations below human hearing is infrasound.
Vibrations above human hearing is ultrasound.Slide5
AmplitudeCorresponds how wave is compressedMeasure of positive or negative change
Amplitude and measure of energy positive correlationEffect different in liquidsSlide6
Wave PhenomenaCan be reflected from surfacesCan undergo diffraction around obstacles
Undergoes refraction when passing through different media.Media
– States of matter.
Waves can interfere with each other.Slide7
PitchPleasant sound has regular wave patternNoise has irregular wave pattern
Deep pitched waves are slowHigh pitched waves are fastSlide8
LoudnessDescription of the ear’s perception of soundOnly doubled with 10-fold increase in intensity
Related to Sound Intensity, not IntensitySound Intensity
– sound power per area
Measurement of the intensity of sound in airSlide9
QualityDistinguishable lyrics of a toneDetermined by harmonic content of the soundSlide10
Creating SoundWhenever an object in vibrates it makes a waveThis makes sound
Sound can be made in all states of matterMany
types
of vibrations, some not obviousSlide11
Detecting SoundSound Waves vibrate your ear drumGoes to your inner ear
Changed to nerve signals you senseCan also feel sounds
Mechanical devices that detect sounds
Such as a microphone
Vibrates an electrical membrane
Then amplified and recordedSlide12
Decibels Measurements of sound pressureMore sound pressure a sound has
= more damage over timeSlide13
SummaryWave – Simple energy through an object.
Frequency measured in hertz and kilohertzSound is created by vibration.