Sound Waves Longitudinal Pitch = frequency

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Presentation transcript:

Sound Waves Longitudinal Pitch = frequency Intensity = amplitude (loudness) Echo = reflection Sound Requires medium (won’t travel in space)

Speed of Sound Speed of sound slower than light speed Speed determined by medium & Temp Air slowest……Water medium….steel fast Sound at warm temp. faster

Ultrasound Higher frequency than humans can hear 20,000 hz Used for echocardiograms (view heart) Used for echolocation by bats & dolphins Used for ultrasounds to see unborn babies

More dense substances reflect sound best = bright

Sonar SOund Navigation And Ranging D = ½ time x speed of sound

Doppler effect Change in pitch caused by moving person moving or sound source moving

Doppler effect