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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

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