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Hearing and
Sound
Transverse Waves – light waves
Sound Energy is produced by the
vibration of matter and travels by
compressional waves.
Speed of sound varies with the
temperature.
Speed of sound changes with the
type of medium.
speed of sound calculator
PBS video on Sound
Sound intensity relates to loudness.
Sound frequency relates to pitch.
Loudness is a measure of amplitude.
It is also called INTENSITY!
The decibel was named after Alexander
Graham Bell, the inventor of the telephone.
Hearing
Human Hearing
Hearing Range
• Hearing test
Sonar
• Sonar
Sonar in ships
Ultrasounds
(above human range of hearing)
• Examples: Bats
• Echolocation
Humans and Echolocation
Daniel Kish
Other Uses for Ultrasounds
• Imaging:
Baby
Echocardiogram
of the heart
Speaking
• Vocal cords
Music
• Harmony- when notes sound pleasing
together. It is actually a function of
mathematical proportions.
• Middle C is 256 Hz
• High C is at 512Hz
• Notes in between need to be
• evenly divisible to sound good
Doppler Effect
• Really Cool Doppler Demo
Doppler Radar
Doppler Effect on the Big Bang Theory
Wave
Interference
Noise Cancelling Headphones
Speech Recognition by computer
http://electronics.howstuffworks.com/gadgets
/high-tech-gadgets/speech-recognition1.htm