- Vibrations create sound
- closed end resonance == vibrating reed
- open ended == flute w/ fluttering column of air
- Frequency of sounds == pitch
- Sound
- Longitudinal
- High and low pressure
- Compression and rarefraction
- needs a medium
- Any medium, best in elastic
- Gas > Liquid > Gas
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- Warm air is better than cold air
- Because warmer air bumps into each other more
- Reflection of sound
- echo
- if too flat then reverbration
- study is called acoustics
- Uneven temperature winds cause sound to refract
- energy is shown by amplitude
- amplitude == loud
- pitch == frequency
- Natural Frequency
- different due to shape/material
- When force is applied to object
- Resonance
- when frequency of forced vibrations == natural frequency a large increase in amplitude happens
- interference
- Beats
- 2 slightly diff frequencies added together cause beats
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- Doppler Effect
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- front and back of moving sound different
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