1/38
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
Sound
Vibrations through a medium
Medium
What a wave is traveling through
Compression
Medium when energy is squeezed together
Refraction
Medium when spread apart
Amplitude
The amount of energy producing the sound
Elasticity
The tendency of a material to resume its initial shape after have been exposed to a distorting force
Speed of sound
331 m/s @0 degrees in air; affected by temperature and medium
Mach
The ratio of the speed of a fast moving object to the speed of sound
Shock wave
Bow wave; coned shaped envelope created from splattering of air molecules at or above the speed of sound
Sonic boom
Sound heard when traveling a multiple of the speed of sound
Frequency
How often something occurs; cycles per second; responsible for sound
Pitch
The apparent frequency of sound; the frequency you hear
Echo
The reflection of a sound wave
Absorption
The transfer of energy into heat due to the texture and shape of the surface
Dead spot
Point of interference between two or more sound waves where no sound is heard
Refraction
Bending of a sound wave due to a change in medium
Diffraction
Bending of a sound wave due to a slit or obstruction
Loudness
Proportional to the amplitude of the sound wave; not measurable
Intensity
Power passing through a specific area; watts per unit area
Sound level
Intensity level; the ratio of intensity to the lowest audible sound
Lowest auditable sound
Hearing threshold; quietest sound able to hear
Decibel
Units of sound level
Doppler effect
The apparent change in frequency due to the motion of the source of sound or receiver of the sound
Natural frequency
Frequency at which an object, once energized, vibrates; resonant frequency
Resonance
When frequency of a vibrating object matches the objects natural frequency
Fundamental frequency
Lowest frequency of sound produced by an object
Harmonic
Frequency that is a multiple of the fundamental frequency
Octave
Interval between two frequencies with a ratio of 2:1
Beat
A pulsing variation in the loudness of a sound cause by interference when two tones of slightly different frequencies are played together
Dissonance
Unpleasant combination of frequencies, out of tune
Concinance
Pleasant combination of frequencies, in tune
Chord
Combination of frequencies in consonance
Quality of sound
How well a sound can be heard
Ear
Organ of hearing that is responsible for maintains equilibrium as well as sensing sound
Cilia
Tiny hairs found in the inner ear that vibrates to enable hearing
Cochlea
Snail shell shaped object in the inner ear that contains the cilia
Range of hearing
Humans have a frequency range of 20-20,000 hz
Longitudinal wave
Sound is
Doppler radar
Type of weather radar that determines whether atmospheric motion is toward it away from radar