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Sound Waves

Sound Waves. 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. Wavelength. Wave - simple energy through an object.

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Sound Waves

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  1. Sound Waves By Rhett Price

  2. 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

  3. Wavelength • Wave - simple energy through an object. • Top of wave called crest • Wavelength - Distance between crests. • Picture on bottom equals one wavelength • Wavelength correlates with frequency • Some wavelengths too short or long to hear

  4. Frequency • Frequency – Cycles within a set time. • Measured in hertz and kilohertz • 1kHz equals 1,000 Hz. • Speed = frequency x wavelength. • Vibrations below human hearing is infrasound. • Vibrations above human hearing is ultrasound.

  5. Amplitude • Corresponds how wave is compressed • Measure of positive or negative change • Amplitude and measure of energy positive correlation • Effect different in liquids

  6. Wave Phenomena • Can be reflected from surfaces • Can undergo diffraction around obstacles • Undergoes refraction when passing through different media. • Media – States of matter. • Waves can interfere with each other.

  7. Pitch • Pleasant sound has regular wave pattern • Noise has irregular wave pattern • Deep pitched waves are slow • High pitched waves are fast

  8. Loudness • Description of the ear’s perception of sound • Only doubled with 10-fold increase in intensity • Related to Sound Intensity, not Intensity • Sound Intensity – sound power per area • Measurement of the intensity of sound in air

  9. Quality • Distinguishable lyrics of a tone • Determined by harmonic content of the sound

  10. Creating Sound • Whenever an object in vibrates it makes a wave • This makes sound • Sound can be made in all states of matter • Many typesof vibrations, some not obvious

  11. Detecting Sound • Sound Waves vibrate your ear drum • Goes to your inner ear • Changed to nerve signals you sense • Can also feel sounds • Mechanical devices that detect sounds • Such as a microphone • Vibrates an electrical membrane • Then amplified and recorded

  12. Decibels • Measurements of sound pressure • More sound pressure a sound has • = more damage over time

  13. Summary • Wave – Simple energy through an object. • Frequency measured in hertz and kilohertz • Sound is created by vibration.

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