Sound Online
Cobblearning.net/mercer
Sound Waves

Prediction: How can you make a guitar produce a loud, high pitched sound? ______

______

Now try and see what happens.

Was your prediction right? ______If different, what did you do to make the guitar produce a loud, high pitched sound? ______

______

Pluck the guitar string gently and strongly. What is the difference in sound? ______

______

Move the slider to shorten the guitar string. How does the pitch change as the string gets shorter? ______

Drag the drum onto the screen. Bang it gently and bang it strongly. What is the difference in the sound?______

Move the slider to tighten the drum skin. How does the pitch change as the drum skin gets tighter?______

Drag the bottle onto the screen. Blow it gently and blow it strongly. What is the difference in the sound? ______

______

Move the slider to fill the bottle with water. How does the pitch change as the bottle fills with water? ______

______

Click on sort sounds to arrange some sounds in order of pitch and loudness. Click on the speakers to hear the sound each recorder makes. Then drag the recorders into position in the grid.

Directions for Online Textbook:

  1. Enter user name and password
  2. Click “Go to Interactive Online Edition”
  3. Select Ch. 21: The Nature of Sound
  4. Click on the “eactivities” orange tab at top of page

Section 1: Sound Wave

  1. The vibrating prongs of the tuning fork create a ______that travels outward away from the source of the ______.
  1. When the prong moves to the ______, the molecules of the medium are pushed ______creating a high pressure region called a ______. When the prong vibrates to the ______, the molecules of the medium are ______apart slightly creating a low pressure region called a ______.
  1. An alternating series of these ______and ______move away from the tuning fork. Because the molecules of the medium move back and forth parallel to the direction of the wave, sound is a ______wave.

Section 2: Speed of Sound

  1. A ______wave is a ______wave caused by vibrations that travel through a material ______, such as air, water, wood, or glass.
  2. List in order from fastest to slowest, the medium in which speed travels.
  3. Steel
  4. Air

Section 2: Pitch

  1. A high ______sound source produces ______sound waves each second than a low frequency sound source.
  1. ______refers to human perception of the sound produced by a sound wave.
  1. The pitch of the sound depends on the ______of the sound wave producing it.

Section 2: Doppler Effect and Sound

  1. The ______is the difference in frequency in a light or sound wave that an observer perceives due to the ______of the source.
  1. If the object is sitting ______, the sound waves traveling from the ambulance reaches each observer at the ______time.
  1. If the ambulance moves ______an observer, the observer hears a ______frequency and ______pitch.
  1. If the ambulance moves ______from an observer, the observer hears a ______frequency and a ______pitch.

Virtual Investigation: The Nature of Sound

  1. Analysis of Sasha’s Sound: Pitch
  2. Higher than Yoyo’s sound
  3. The same as Yoyo’s sound
  4. Lower than Yoyo’s sound
  5. Analysis of Sasha’s Sound: Loudness
  6. Louder than Yoyo’s sound
  7. The same as Yoyo’s sound
  8. Softer than Yoyo’s sound
  9. Analysis of Thomas’s Sound: Pitch
  10. Higher than Yoyo’s sound
  11. The same as Yoyo’s sound
  12. Lower than Yoyo’s sound
  13. Analysis of Thomas’s Sound: Loudness
  14. Louder than Yoyo’s sound
  15. The same as Yoyo’s sound
  16. Softer than Yoyo’s sound