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20 terms

Physics Ch 26

STUDY
PLAY
Pitch
description of our subjective impression about the frequency of sound
the property of sound that varies directly with variation in the frequency of vibration
Sound intensity
Amount of energy that a sound wave brings to a unit area every second.
objective - measured by instruments
Resonance
when there is a force to pull it back to its starting position and enough energy to keep it vibrating
Shock wave
The cone-shaped disturbance created by an object moving at supersonic speed through a fluid.
Infrasonic
sound waves with frequencies below 20 hertz
Loudness
physiological sensation sensed in the brain - more mental
Beats
when two tones of slightly different frequency are sounded together - it is that fluctuation in the loudness of the combined soudns
Bow wave
The V-shaped wave produced by an object moving on a liquid surface faster than the wave speed.
Destructive interference
the interference that occurs when two waves combine to make a wave with a smaller amplitude
Ultrasonic
sound waves with frequencies above 20,000 hertz
Decibel
unit of intensity for sound
Supersonic
faster than the speed of sound
Natural frequency
A frequency at which an elastic object naturally tends to vibrate, so that minimum energy is required to produce a forced vibration or continue vibration at that frequency.
Compression
the part of a longitudinal wave where the particles of the medium are close together
Oscilloscope
an instrument that can be used to record voice vibrations and show voice patterns
Amplitude
the height of a wave's crest
can be dramatically increased by resonance
Rarefaction
a part in a longitudinal wave where the particles are spread apart
Forced vibration
the vibration of an object that is made to vibrate by another vibrating object
Wavelength
the distance (measured in the direction of propagation) between two points in the same phase in consecutive cycles of a wave
Elasticity
the tendency of a body to return to its original shape after it has been stretched or compressed