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Sound Waves

Sound Waves. Sound is a compressional or longitudinal wave The “wiggle” (compression) is in the same direction as the wave travels. Frequency. All waves have a frequency The frequency of a sound determines the pitch of the sound High frequency, high pitch

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Sound Waves

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  1. Sound Waves

  2. Sound is a compressional or longitudinal wave • The “wiggle” (compression) is in the same direction as the wave travels

  3. Frequency • All waves have a frequency • The frequency of a sound determines the pitch of the sound • High frequency, high pitch • Standard human hearing range is from 20 Hz to 20,000 Hz

  4. Amplitude • Amplitude of a transverse wave relates to how tall the wave is • Amplitude in a compressional wave relates to how much is compressed • The amplitude of a sound determines its intensity, or loudness

  5. Doppler Effect • The Doppler Effect is an apparent change in the pitch of a sound caused by the motion of the sound generator • Emergency vehicle sirens, and car tires, sound higher as they approach and lower as they pass • The Doppler Ball will do the same thing!

  6. The apparent change in pitch is caused by a change in the distances between waves • As a wave is created, it moves away from the source • If the source move in the same direction as the wave, chasing it, the next wave will be closer to the previous wave, creating a higher pitch

  7. As the sound source moves away, it creates a larger distance between the first and second wave, creating a lower pitch • Internet demo

  8. Natural Frequency • When many objects fall or get hit, they ring – like the tuning fork • The specific frequency, or frequencies, an object rings at is its natural frequency • Using your finger to make a water glass ring is showing its natural frequency

  9. Resonance • When another sound or vibration continues to hit an object, it can cause the other object to vibrate • If the frequency of the sound matches the natural frequency of the other object, it can cause resonance • This means that the object will vibrate, and can increase vibrations • Resonance was how the Myth Busters were able to break the wine glass

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