1. 9 th Grade Science Chapter 12c

2.  Definition: ◦ Sounds used in regular pattern that is pleasing to hear  Every musical instrument has: ◦ Natural frequency:  Frequency that it vibrates at because of its construction  Common factors: thickness, length, material ◦ Resonance :  Increased amplitude of vibration at certain frequencies

3.  Quality refers to differences in sound with same frequency and intensity ◦ For example:  What causes quality?  Overtones: ◦ Multiples of fundamental frequency that are heard along with the fundamental frequency

5.  Stringed instruments: ◦ Make sounds by: ◦ Example  Brass ◦ Make sounds by: ◦ Example  Woodwinds ◦ Make sounds by ◦ Example  Percussion ◦ Make sounds by ◦ Example

6.  Sound waves interfere!  Overlapping waves create pulsing sound  How to calculate the beats: