Hearing and Sound.

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Presentation transcript:

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