Chapter 20: Sound Flashcards
Sound is a variation of
The pressure of a medium
Sound is a typically of
Air
Sound propagates as a
Longitudinal pressure wave
Sound travel at a speed characteristics of
The medium in which it propagates
Sound is our ear are devices which
Detect sound
Sound is a form of
Energy that exist whether or not it is heard
Most sounds are waves produced by
The vibration of matter
The vibrating material then sends a disturbance through the surrounding medium, usually air, in the form of
Longitudinal sounds waves
Under ordinary condition, the frequencies of the vibrating source and sound waves are
The same
The subjective impression about the frequency of sound is called
Pitch
The ear of a young person can normally hear pitches corresponding to the range of frequencies between about
20 and 20,000 Hertz
Sound waves with frequencies below 20 Hertz are
Infrasonic (frequency too low for human hearing)
Sound waves with frequencies above 20,000 hertz are called
Ultrasonic (frequency too high for human hearing)
Human cannot hearing the two different types of sounds, what was that?
Infrasonic and ultrasonic sound
Sound waves are
Vibrations made of compressions and rarefraction
Sound waves are (2)
Longitudinal waves
Sound wave requires
A medium
Sound wave travels through
Solids, liquids, and gases
The wavelength of sound were the distance between
Successive compressions or rarefactions and both of them travel at the same wave speed
Medium that transmit
Sound
Any elastic substance - solid, liquid, gas, or plasma can
Transmit sound
In elastic liquids and solids, the atoms are relatively
Close together, respond quickly to one another’s motions and transmit energy with little loss
Sound wave about 4 times faster in water than in air and about
15 times faster in steel than in air