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Sound & Waves

Sound & Waves. A primer for Animals & hEaring. Sound is Vibration. Vibrations create Waves. Characteristics of Waves. Amplitude. Characteristics of Waves. Characteristics of Waves. Frequency in a Sound Wave determines Pitch. Describing Waves (rope demonstration). Frequency Amplitude

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Sound & Waves

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  1. Sound & Waves A primer for Animals & hEaring

  2. Sound is Vibration

  3. Vibrations create Waves

  4. Characteristics of Waves

  5. Amplitude

  6. Characteristics of Waves

  7. Characteristics of Waves

  8. Frequency in a Sound Wave determines Pitch

  9. Describing Waves (rope demonstration) Frequency Amplitude Wavelength Period = the time between the wave crests

  10. Describing Sound Frequency = Pitch Amplitude = Volume (how loud it sounds) What is the term for reflected sound?

  11. Tuning Forks & Frequency Which tuning fork will have a higher pitch? UNITS Frequency is measured in Hertz Hertz = Cycles per Second, ie. the number of “S” curves in one second. These Tuning forks create sounds with frequency 256 Hz & 512 Hz.

  12. Tuning Forks & Frequency Which tuning fork will have a higher pitch? UNITS Frequency is measured in Hertz Hertz = Cycles per Second, ie. the number of “S” curves in one second. These Tuning forks create sounds with frequency 256 Hz & 512 Hz. 256 Hz 512 Hz

  13. Not all Frequencies of Vibration can be Heard

  14. Day 2 Materials • 4 Stethocopes • Tuning forks • Ear funnel setup • Flour baggie/watch/air baggie • Slinky • Funnel/milk jug to hold up to the ear

  15. Describe this wave in terms of frequency, amplitude and wavelength.

  16. Day 2: Movement of Sound Sound Waves Travel through: Gases Liquids Solids Sound does NOT travel through a vacuum. It requires a medium.

  17. Air is the medium for this sound wave

  18. Compression Wave • http://www.acs.psu.edu/drussell/Demos/rad2/mdq.html • http://en.wikipedia.org/wiki/File:Onde_compression_impulsion_1d_30_petit.gif

  19. A Slinky Can be a Hands On model of movement of a Compression Wave

  20. If sound is a compression wave,which medium do you think it will move faster through?

  21. Sound travels more efficiently through solids than gases. The sound of the ticking watch will be louder through the flour than through the air.

  22. Which will be louder?

  23. Sound travels more efficiently through liquids than gases

  24. Speed of Sound

  25. Direction of Sound The brain interprets direction from which a sound orginates by the difference in time it takes to get to each ear.

  26. Amplify Sound If sound is created by vibrations, what is a strategy for making a sound louder?

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