| A | B |
|---|
| Sound is a __________ wave | longitudinal (compressional) |
| Sound does or does not need a medium | Sound needs a medium |
| velocity of sound in air | 343 m/s @ 20 C @ sea level |
| Doppler shift is | change in the frequency of sound caused by the motion of either the source or the detector |
| The frequency of a sound wave is called the ____________? | pitch |
| Two notes that differ by one octave have a pitches with a ratio of | 2 to 1 |
| Amplitude of a sound wave is measured in | dB |
| The ear percieves sound as _________? | loudness |
| Two waves with almost the same frequency interfere to produce a _____________? | beat or beat note |
| The quality of the wave is called the _____________? | timbre |
| Timbre depends on the _____________? | number and intensity of the harmonics it produces |
| Decibles are a ____________ scale? | Logrithmic (10 times barely audible is 20 dB, ten time that is 40 dB, etc...) |
| Ear is most sensitive to sounds from _______Hz to ___________ Hz? | 1000 to 5000 |
| Open pipe resonator | Resonating tube with one end is open (RESONATES WHEN ITS LENGTH IS AN even NUMBER OF QUARTER WAVELENGTHS) ex sax, flute |
| Closed pipe resonator | Resonating tube with both ends are fixed (RESONATES WHEN ITS LENGTH IS AN odd NUMBER OF QUARTER WAVELENGTHS) ex. guitar |
