Unit 9- Sounds

What is a sound?  A sound is a vibration that causes a longitudinal wave.  In order for the longitudinal wave to transfer through there needs to be  medium which is the material that the wave is in.  There NEEDS to be a medium in order for the sound wave to transfer through.  One of the main factors that can change sound waves is temperature.  When the temperature is colder the sound particles travel faster and when the temperature is hot the sound particles travel slower.  In Unit 9 we learned about two things that are importantly related to sound waves and they are resonance and pitch.  Resonance is the increase of amplitude of a system exposed to a force at an objects natural frequency so in other words it is the vibration of an object.  Pitch is the frequency of sound which is how loud and clear the sound is.