Sound
Sound Wave
Pitch
Loudness
Decibel
Doppler Effect
Compression
Rarefacation
Ultrasound
Infrasound
Subsonic
Speed of Sound
Supersonic
Hypersonic
Mach 1
Closed Pipe
Resonator
Open Pipe
Resonator
Fundamental
Harmonics
Consonance
Dissonance
Timbre
Pinnae
Tympanic Membrane
Cochlea
Ossicles
Eustachian Tube
Auditory Nerve
Beat Frequency
Physics Chapter 15: Sound Flash Cards
The frequency of a pressure variation.
The pitch is also what ‘note’ an object
‘sings’.
A pressure variation that needs a
medium to propagate through.
A human perception. All sound is
sound waves (pressure variations), but
not all sound waves are sound. Some
are below or above our frequency
range.
The apparent shift in frequency due to
relative motion between sound emitter
and/or sound detector.
Moving toward = higher frequency
Moving away = lower frequency
A measure of sound loudness. A 20
dB increase is a 10x larger wave, and
a 10 dB increase sounds twice as loud
in the human perception
Loudness is the amplitude of a sound
wave. It is measured in the decibel
scale..
When molecules of a media are pulled
farther apart.
When molecules of a media are
squeezed together.
Speeds below the speed of sound.
Sound below what humans can
perceive.
Frequencies above what humans can hear.
Human perception is between 20 Hz and
16,000 Hz
Speed of sound is 343 m/s in air at 20
degrees C at 1 ATM of pressure
Human perception is between 20 Hz and
Speed of sound depends on: Medium,
Temperature, and Pressure.
Mach 1 is one time the speed of
sound. Mach 2 is two times the speed
of sound, and so on.
16,000 Hz
All speeds faster than Mach 5
All speeds faster than the speed of
sound
A tube with both sides open such as a
pan flute.
Wavelengths of 2/4, 4/4, 6/4 …
resonate in these pipes.
The resonant lengths are spaced by ½
wavelength intervals.
A tube with one side closed such as a
soda bottle.
Wavelengths of ¼, ¾, 5/4, … resonate
in these pipes.
The resonant lengths are spaced by ½
wavelength intervals.
An unpleasant combination of
frequencies.
A pleasant combination of frequencies
Higher frequencies, which are oddnumber multiples of the fundamental
frequency, are called harmonics.
Outer cartilage of ear
Eardrum
Fluid filled sack ossicles push on
3 small bones that amp. sound
Tube connecting ear to throat
Nerve connecting cochlea to brain
Tone color. The unique sounding
voice of an object that is a result of
exactly how it vibrates.
Mach 1 is around 343 m/s or 760 mph
The most prominent note that an
object plays.
Always the lowest frequency that an
object can play. In a closed pipe, its
¼ λ and in an open pipe its ½ λ
The oscillation of volume caused by
alternating constructive and
destructive interference of two
frequencies that are nearly identical.