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Transcript of Ukulele Physics
To understand resonance, take a swing for example. When you push a swing its natural tendency is to rock back and forth on its own like a pendulum. The natural back and forth motion is its natural frequency. It works the same with a ukulele being strummed; it causes the instrument to resonate! REVERBERATION When the ukulele is strummed, the sound that is created subtly bounces back off of the inside of the ukulele. When the sound that is initiated combines with the sound bounced back, reverberation is produced. Reverberation causes somewhat of a delay on the sound. This is the same reason you hear an echoed sound in an auditorium, because the space provides for it. Ellen Atwood Physics of the Ukulele AMPLITUDE Amplitude-the amount of energy in a sound wave. More energy = more sound = LOUDER
Less energy = less sound = softer
Therefore, the greater the amplitude, the louder the sound.
The amplitude is also the size of the vibration created by the instrument; larger vibrations make a larger sound. FREQUENCY Frequency- number of waves passing a point per second or the speed of the vibration.
Higher frequency=higher pitch=smaller wavelength
Lower frequency=lower pitch=larger wavelength
Frequency is measured in Hertz! (Hz)
For a ukulele, the four strings have the following frequencies also known as harmonics
G: 392 Hz
C: 261 Hz
E: 329 Hz
A: 440 Hz The body of the ukulele allows the instrument to resonate! The sound hole allows sound waves to exit the body of the ukulele The soundboard, located inside the ukulele, allows the sound to be amplified when the boards vibrate FREQUENCY CONT... We already covered that frequency affects pitch.
On a ukulele, the pitch is effected by the length and tightness of each string. The longer the string is the lower the pitch will be because the vibrations will be bigger, and vise versa. The tighter a string is, the higher the pitch will be because it gives less leeway for vibration. You can also change the pitch by holding your finger down on different frets, which shortens the string. the tuning head on a ukulele can adjust the pitch of each string, and in turn change the frequency of each string. WORKS CITED . "Reverberation." Wikipedia. Wikipedia foundation, 5 2012. Web. 5 Dec 2012. <http://en.wikipedia.org/wiki/Reverberation>.Paff, Troy. "Music." Curiosity. University of Phoenix, n.d. Web. 5 Dec 2012. <http://curiosity.discovery.com/question/role-sound-in-guitar-body>.Cross, Dan. "The Soundboard." About.com. N.p., n.d. Web. 5 Dec 2012. <http://guitar.about.com/od/helpbuyingguitarsgear/a/gtr_soundboard.htm>.Mueller, Fritz. "Resonances." . Fritz Mueller, n.d. Web. 5 Dec 2012. <http://www.classicalguitars.ca/resonances.htm>.Hass, Jeffrey. "What is Amplitude?." Indiana.edu. Indiana University, n.d. Web. 6 Dec 2012. <http://www.indiana.edu/~emusic/acoustics/amplitude.htm>.. "Harmonic Series." Wikipedia. Wikipedia foundation, 1 2012. Web. 6 Dec 2012. <http://en.wikipedia.org/wiki/Harmonic_series_(music)>. SOUND! A sound wave is a is how sound travels through the air. They create compressions, which is where molecules in the air are compressed together.
Wavelength- is the distance crest to crest (top to top) on a sound wave.