Photo Album

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Photo Album

• by Robert MacKay

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Sound waves are longitudinal waves

• http//faraday.physics.utoronto.ca/IYearLab/Intros
  /StandingWaves/Flash/tunefork.html

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Audible range 20 20,000 Hzdecreases with age
and damage
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Speed of sound in Air

• Depends of the air temperature. Higher air
  temperture the higher the speed.
• Depends of the molecular mass of air. Faster in
  helium, slower in air, and slower yet in Xenon.

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• During a lightning storm the thunder is heard 6
  seconds after the flash. How far away was the
  lightning strike?

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• During a lightning storm the thunder is heard 6
  seconds after the flash. How far away was the
  lightning strike?
• 2 km

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Speed of sound in Air

• Depends of the air temperature. Higher air
  temperture the higher the speed.
• Depends of the molecular mass of air. Faster in
  helium, slower in air, and slower yet in Xenon.

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• During a lightning storm the thunder is heard 10
  seconds after the flash. How far away was the
  lightning strike?

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• During a lightning storm the thunder is heard 10
  seconds after the flash. How far away was the
  lightning strike?
• 2 miles

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Speed of sound in solids

• Depends of the elasticity of solid. The stiffer
  the solid the higher the speed.
• Depends of the solid density. The lower a
  solids density the higher the speed.

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Beats

• The beat frequency is the difference between two
  frequencies.

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Beats are used in tuning

• when tuning a guitar a beat frequency of 3 Hz is
  heard when comparing the sound from the guitar to
  256 Hz tuning fork.
• What is the guitar strings frequency?

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Beats are used in tuning

• when tuning a guitar a beat frequency of 3 Hz is
  heard when comparing the sound from the guitar to
  256 Hz tuning fork.
• What is the guitar strings frequency? 253 or
  259 Hz (cant say for sure which one)

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Beats are used in tuning

• when tuning a guitar a beat frequency of 3 Hz is
  heard when comparing the sound from the guitar to
  256 Hz tuning fork. The string is then slightly
  tightened and a beat frequency of 4 Hz is
  observed.
• What is the guitar strings frequency now?

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Beats are used in tuning

• when tuning a guitar a beat frequency of 3 Hz is
  heard when comparing the sound from the guitar to
  256 Hz tuning fork. The string is then slightly
  tightened and a beat frequency of 4 Hz is
  observed.
• What is the guitar strings frequency now? 260 Hz

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Decibel Sound Level
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its actually easy

• intensity 10 (101) louder 10 dB higher
• intensity 100 (102) louder 20 dB higher
• intensity 1000 (103) louder 30 dB higher
• intensity 10,000 (104) louder 40 dB higher
• intensity 1,000,000 (106) louder 60 dB higher

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