 What is the source of all sound?  What are the conditions of simple harmonic motion?  What are the aspects of a wave?  How are sound waves produced?  What is the Doppler effect?

 The source of all sound is vibrations of material in objects.  Ex. – vocal chords when you talk, strings on a guitar, reed on a saxophone  High pitch, high frequency, low pitch, low frequency

TThe wave is in equilibrium RRestoring force is proportional to the displacement from equilibrium EEx.- pendulum (restoring force is gravity, displacement is us) CCan’t really happen

 Medium- object getting disturbed  Amplitude- distance from midpoint to maximum or from midpoint to minimum  Crest- maximum of a wave  Trough- minimum of a wave  Wavelength- distance from one crest to the next  Frequency=wavelength, Pitch=amplitude

 Original vibration makes something larger vibrate  Sends a disturbance through the air through surrounding medium  Sound moves through steel 15 times faster and water 4 times faster than in air

 The change in frequency of a wave for an observer moving relative to its source.  Ex.- a car’s horn is higher in pitch when it is closer because the distance is smaller, making the frequency higher