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SOUND WAVES A.Sound waves are longitudinal. B.Sound waves are mechanical- they need a medium and a vibration. C.Sound does not travel in a vacuum.

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Presentation on theme: "SOUND WAVES A.Sound waves are longitudinal. B.Sound waves are mechanical- they need a medium and a vibration. C.Sound does not travel in a vacuum."— Presentation transcript:

1 SOUND WAVES A.Sound waves are longitudinal. B.Sound waves are mechanical- they need a medium and a vibration. C.Sound does not travel in a vacuum.

2 Sound Waves

3 VELOCITY OF SOUND At STP sound travels 3.31 x 10 2 m/s > It’s 4 times faster in water. > It’s 15 times faster in metal. Will change due to temperature: v = 331m/s + 0.6(T) (T is in Celsius)

4 Sound is a range of wave frequencies that the ear is sensitive to. (20Hz- 20,000Hz) Infrasonic sound- Sounds lower than 20Hz Ultrasonic sound- frequencies higher than 20,000Hz Transmission Range- frequencies an organism can produce ( humans 85- 1000Hz)

5 Hearing Ranges

6 How does the ear work?  The outer ear “catches the sound waves”.  The middle ear takes the sound waves and “vibrates” the eardrum.  The inner ear sends the messages to the brain. Middle Ear Inner Ear http://www.youtube.com/watch?v=pCCcFDoyBxM Outer Ear

7 Talking http://www.youtub e.com/watch?v=Jz yHKYQzPBkhttp://www.youtub e.com/watch?v=Jz yHKYQzPBk http://www.youtub e.com/watch?v=d- XbjFn3aqEhttp://www.youtub e.com/watch?v=d- XbjFn3aqE

8 FREQUENCY Frequency- the number of vibrations per second. How the ear identifies this vibration is called pitch. Pitch and frequency are directly proportional. High Pitch Low Pitch http://www.animations.physics.unsw.edu.au/jw/sound-pitch-loudness-timbre.htm

9 FUN INFO The phone company uses a combination of frequencies to make a unique sound for each number on the phone. #1 is 687Hz and 1209Hz #2 is 687Hz and 1336Hz #3 is 687Hz and 1477Hz http://soundbible.com/tags-dial.html

10 AMPLITUDE Amplitude- the maximum displacement of the particles from equilibrium. Amplitude determines the intensity of the sound and how loud it is. http://www.animations.physics.unsw.edu.au/jw/sound-pitch-loudness- timbre.htm

11 SOUND INTENSITY Sound Intensity- the rate of flow of sound energy from a source. Measured in decibels or watts/meter 2 According to OSHA 85dB and higher will produce permanent hearing damage.

12 HOMEWORK FROM TEXT BOOK pg 369 #21-23 and #25-30 Show all formula’s and calculations!

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