Pure Tones and the Sine Wave - University of Rochester
[Pages:38]Pure Tones and the Sine Wave
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Physics of Music PHY103 Lecture 2
Trig definition of a sine wave
Period or wavelength
amplitude
From math learning service U. Adelaide
Harmonic motion
From ecommons.uwinnipeg.ca/ archive/ 00000030/
Velocity and Position Sine and Cosine
Sine and Cosine
From www2.lvosbury/AnimationsForTrigono...
Pythagorean theorem Conservation of Energy
a=c Cos()
b=c Sin()
When the spring is extended, the velocity is zero. When the spring is in the middle, the velocity is maximum. The position is the sine wave, the velocity is the cosine wave. Kinetic energy (square of velocity) + Potential energy (square of position) is total energy is conserved.
Making a pure tone with Matlab
Period (units time or seconds)
Amplitude
Sine Wave
Wavelength (units cm)
Sine Wave
Amplitude
Position x For a wave on water or on a string - spatial
variation instead of temporal variation
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