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Changing Sound

Changing Sound. Review. Back and forth movements are called: __________. vibrations. Review. sound. __________ is vibrations that you can hear. Review. The area where the air is pushed together is called a ___________. compression. Review. Sound waves.

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Changing Sound

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  1. Changing Sound

  2. Review • Back and forth movements are called: __________ vibrations

  3. Review sound • __________ is vibrations that you can hear.

  4. Review • The area where the air is pushed together is called a ___________ compression

  5. Review Sound waves • ___________ are quickly moving areas of high and low pressure.

  6. Review • The height of a sound wave is called its _____________ amplitude

  7. Review • The width of a sound wave is called its _____________ wavelength

  8. Review • Sound waves move through the three parts of the ear. The brain processes the signals as __________. sound

  9. Review • Sound waves move (away from or towards?) the person hearing the sound. towards

  10. Sound • Sound travels in waves. • A sound can be: • Loud or soft • High or low

  11. Loud or Soft • How loud or soft a sound is – this is called loudness. • Loudness is a measure of the amount of sound energy reaching your ears. • Whisper or shout

  12. Loud or Soft • Louder = more sound energy reaching your ears • Softer = less sound energy reaching your ears

  13. Loudness • The loudness of a sound depends on how far the vibrating object is moving as it goes back and forth. • Ruler on desk • If you hit a drum harder or slam a door harder, you make a louder sound.

  14. High and Low Sounds • You can make loud and soft sounds, but you can also make high and low sounds. • Dog growl = low sound • Mouse squeak = high sound

  15. Pitch • How high or low a sound is = pitch • Pitch depends on how fast the source of the object is vibrating.

  16. Pitch • Faster vibrations = higher pitch • Slower vibrations = lower pitch

  17. Pitch • Pitch can also be changed by changing the length of the object that is vibrating. • Ruler on desk

  18. Sound Waves • The height of the sound waves is called its amplitude. • The width of a sound wave is called wavelength.

  19. Amplitude and Wavelength

  20. Changing Sounds • Volume and pitch can be affected by changing the sound waves.

  21. Loud and Soft Sounds • A loud sound has a high amplitude. • A soft sound has a low amplitude.

  22. High and Low Sounds • A high pitch has waves that are closer together (short wavelength). • A low pitch has waves that are further apart (long wavelength).

  23. Changing Pitch • Many musical instruments can be played at different pitches by changing the length of certain parts. • A guitar or violin player puts his or her fingers down on the strings in different places. • This changes the length of the vibrating strings. • As a result, the guitar or violin plays different pitches.

  24. Changing Pitch • Another way to make a different pitch is to change the thickness of the material that vibrates. • A thin string vibrates faster than a thick string.

  25. Changing Pitch and Volume on a Guitar

  26. Review loudness • ___________ is a measure of the amount of sound energy that reaches your ears.

  27. Review pitch • ___________ is how high or low a sound is.

  28. Review louder • More sound energy = ________ sound

  29. Review softer • Less sound energy = ________ sound

  30. Review high • Faster vibrations = ________ pitch

  31. Review low • Slower vibrations = ________ pitch

  32. Review • When you change the amplitude (height) of a sound wave, you change its _________. loudness

  33. Review • When you change the wavelength (width) of a sound wave, you change its _________. pitch

  34. Review • To change the pitch of an object, you can change the _________ of a vibrating object or the _________ of a vibrating string. length thickness

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