Exam 1 Flashcards
Sound
the vibrations of a sound source, transmitted through the air or another medium, that have the potential to stimulate the organs of hearing
Elasticity
the restoring force that causes an elastic medium to bounce back when stretched or displaced
Inertia
the tendency for motion or lack of motion to continue
Compression
molecules are closer together and the air pressure is tighter
Rarefaction
Molecules are farther apart and air pressure is lower
Sinusoidal motion or simple harmonic motion
moving back and forth a fixed number of times per second no matter how hard the tuning fork is struck
Amplitude
intensity or power of the sound
Wavelength
distance from any point in one cycle to the corresponding point in a neighboring cycle
Cycle
one cycle of vibration is completed at the point where the motion of a vibrating body or a pressure wave begins to repeat itself
Period
the time taken for each cycle of vibration
Frequency
the number of completed cycles (back-and-forth movements) per second; expressed in units of Hertz
Complex sound
sound having more than one sine wave component
Spectrum
an indication of the frequency and amplitude of each harmonic in a complex periodic wave
Periodicity
the pattern of vibration, however complex, repeats itself exactly over time
Aperiodicity
vibration is random and displays no repeatable pattern
Power/intensity
Magnitude of sound expressed in power or pressure; dB IL = 10(log10 Wo/Wr)
Pressure/SPL
force per unit area; dB SPL = 20 (log10 Po/Pr)
Resonance
vibratory response to an applied force
Natural Resonant Frequency
frequency in which the swing completes a cycle during 1 second
frequency from period (formula)
F =1/p
Period from frequency (formula)
P = 1/f
Wavelength from Period (formula)
fλ = c; c = 344 m/s; λ = c/f = 344(m/s)/200 Hz = 1.72 m
dB SPL
dB SPL = 20(log10 Po/Pr)
