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Sound and Hearing

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Sound and Hearing Section 17.4 Properties of Sound Waves Sound waves- longitudinal waves that travel through a medium Sound Waves Speed Speed varies depending on the ... – PowerPoint PPT presentation

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Title: Sound and Hearing


1
Sound and Hearing
  • Section 17.4

2
Properties of Sound Waves
  • Sound waves- longitudinal waves that travel
    through a medium

3
Sound Waves
Properties of Sound waves
Speed
Frequency and Pitch
Intensity and Loudness
4
Speed
  • Speed varies depending on the
  • Substance
  • State of matter
  • that the vibrations are traveling through

5
Speed
Medium Temperature Speed of sound
Air 20 342 m/s
Water 30 1509 m/s
Borosilicate glass 25 5170 m/s
6
Intensity and Loudness
  • Intensity is the rate at which a waves energy
    flows through a given area
  • Units decibel (dB)
  • Powers of 10
  • 30 dB is 1000x more intense than 0 dB

7
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8
Intensity and Loudness
  • Loudness physical response to the intensity of
    sound, modified by physical factors
  • Very subjective
  • Depends on intensity

9
Frequency and Pitch
  • Frequency of sound depends on how fast the source
    is vibrating
  • Pitch- frequency of a sound as you perceive it
  • subjective

10
Frequency and pitch
  • Longer tube, longer wavelength, lower pitch
  • Shorter tube, shorter wavelength, higher pitch

11
Ultrasound
  • Lower pitch than we can hear
  • Used in sonar and ultrasound imaging
  • Sonar determines the distance to an object in
    water

12
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13
The Doppler Effect
  • Doppler Effect- change in sound frequency caused
    by
  • Motion of sound source
  • Motion of listener
  • Both

14
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15
The Doppler Effect
  • As the source of sound approaches, the person
    hears a higher frequency ( pitch)
  • When the source moves away, the observer hears a
    lower frequency ( pitch)

16
How Sound is Reproduced
  • Sound waves are converted into electrical signals
  • Electrical signals cause a magnet to vibrate
  • Makes sound

17
Reviewing Concepts
  • What is the Doppler Effect?
  • List and briefly describe the 5 properties used
    to explain the behavior of sound waves
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