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Physics of Sound. Investigation 2: Good Vibrations Part 1 Vibration and Pitch. Objectives. I can identify HIGH and LOW pitches. I can compare the vibrations of high and low pitches. I can compare pitch and volume. I can explain what happens to vibrations when the pitch changes.

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Physics of Sound


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    1. Physics of Sound Investigation 2: Good Vibrations Part 1 Vibration and Pitch

    2. Objectives • I can identify HIGH and LOW pitches. • I can compare the vibrations of high and low pitches. • I can compare pitch and volume. • I can explain what happens to vibrations when the pitch changes.

    3. Voice the Vibrations • Remember the observations you made with the tone generator, the long gong, and the tuning forks. • Do you remember these vocabulary words? • Sound source • Sound receiver • Vibration • Volume • What is the source of the sound of my voice? • Does a person’s voice make vibrations? • Put your fingers on your throat and feel the vibration as you hum.

    4. Give Your Pitch • PITCH describes how high or low a sound is. • High-pitched sounds include squeaks and screeches. • Low-pitched sounds include rumbles and growls.

    5. Generate some body language • Stand next to your desks. • Squat lowwhen you hear a low pitch. • Begin standing when you hear a mid-range pitch. • Stand tall when you hear a high pitch. • Reach up as high as you can when the pitch is very high.

    6. Make sounds with a tongue depressor • Watch how to do it: • Put the tongue depressor on your desk so that the end sticks out over the edge like a little diving board • Use the ‘heel’ of your hand to hold the Tongue depressor • Pluck the tip of the tongue depressor • Your job: • Discover ways to make high and low pitches with a tongue depressor

    7. Share results • Return materials • How did you make high- and low-pitched sounds? • What is the highest pitch you could make? • What is the lowest pitch you could make? • Where are the vibrations? • Compare the vibrations of the low and high pitches. Are the vibrations different? How?

    8. Fiddle around • Web Link • What pitch do you hear from the long string? • What do you see? • What pitch do you hear from the short string? • Do the two strings vibrate the same?

    9. Frequency • Faster vibrations make higherpitches. • Slower vibrations make lower pitches. • How fast or how slow something is vibrating is called the frequencyof the vibration.

    10. Compare pitch and volume • Watch the beans on the tone generator. • What do you think you will see as the pitch changes? • What happens to the beans as the pitch changes? • What is pitch? • What happens to the vibrations when the pitch changes?

    11. Compare pitch and volume • Find the “bounciest” pitch level. • Observe the beans as the volume changes. • What is volume? • What happens to the vibrations as the volume changes?

    12. The voice • Feel your throat as you make high and low pitched sounds. Keep the volume at a whisper. • What do you feel? • Now, keep the pitch the same as you increase the volume from a whisper to a hum. • What happens to the vibrations?

    13. Vocabulary review • PITCH • Describes how high or low a sound is • FREQUENCY • How fast or slow something is vibrating

    14. Objectives • I can identify HIGH and LOW pitches. • I can compare the vibrations of high and low pitches. • I can compare pitch and volume. • I can explain what happens to vibrations when the pitch changes. • EXIT SLIP