Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Nature of Sound
| Question | Answer |
|---|---|
| Frequency | rate at which the molecular wave moves forward and back (vibrates). called pitch by musicians. Measured in Hz |
| Range of frequency humans are likely to hear | 20-20,000 Hz, if enough amplitude |
| Frequency of A above middle C | 220 Hz |
| Hertz | cycles per second |
| amplitude | amount of disturbance of the air (loudness). low=quiet. high=loud. |
| vibration is... | the source of sound. all sound is associated with vibration of some sort. |
| What, combined, define the basic elements of sound? | frequency and amplitude |
| What happens in your ears when you change altitude driving up a canyon? | high pressure air behind ear drums expands as outside pressure drops. to equalize pressure you open a small tube in the throat (Eustachian tube) that connects to that space behind your ear drum |
| How does your voice make sound? | It is driven by air from the lungs passing through vocal folds. Muscles attached to cords pull them tight -> they flap rapidly (VIBRATE) and MODULATE the air stream |
| modulate | vary in a regular fashion |
| What mechanism do flutes and whistles use to make sound? | mechanism called an edge (creates an edgetone) |
| How do you go up an octave on a flute? | blow harder to speed up the air flow |
| How does an edge tone work? | It generates vibrations in the air stream as it moves past the "edge." Velocity of air stream rises -> air is pulled into lower pressure area of flute, moving low pressure area outside the flute, and the air stream is pulled up toward that. |
| How do general woodwinds work? | A flexible, thin, springy reed at one end of a tube vibrates. The reed opens and closes like vocal folds. Finger holes change length of the tube. Reed vibrates at a speed that matches tube length. |
| How do brass instruments work? | Blow into them with pursed lips -> lips vibrate at one end of tube. |
| What are partials? | Sets of notes that each tube length of a brass instrument plays. |
| Why do brass instruments have multiple tubes? | Different tube lengths result in different lip speeds. Any tube will only resonate at certain frequencies. Brass instruments need additional tube lengths for different sets of partials to be played. |
| What are valves on brass instruments for? | Pressing valves re-routes air to different length tube paths |
| How do string instruments work? | Strings are coupled to a resonating box, and are VIBRATED by plucking or bowing. Change string length to change pitch (long=low, short=high) |
Created by:
mortehay000
Popular Sanskrit sets