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21 Cards in this Set

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  • Back
Amplitude
For a wave or vibration, the maximum displacement on either side of the equilibrium (midpoint) position.
Beats
A series of alternate reinforcements and cancellations produced by the interference of two waves of slightly different frequency, heard as a throbbing effect in sound waves.
Bow Wave
The V- shaped wave produced by an object moving across a liquid surface at a speed greater than the wave speed.
Doppler Effect
The change in frequency of wave motion resulting from motion of the wave source or receiver.
Forced Vibration
The setting up of vibrations in an object by a vibrating force.
Frequency
For a vibrating body or medium, the number of vibrations per unit time. For a wave the # of crests that pass a particular point per unit.
Hertz
The SI unit of frequency. It equals one vibration per second.
Interference
The pattern formed by superposition of different sets of waves that produces mutual reinforcement in some places and cancellation in others.
Longitudinal Wave
A wave in which the medium vibrates in a direction parallel (longitudinal) to the direction in which the wave travels. Ex: Sound
Natural Frequency
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 to continue vibrating at that frequency.
Period
The time required for a vibration or a wave to make a complete cycle; equal to 1/frequency.
Refraction
The bending of a wave through either a non- uniform medium or from one medium to another, caused by differences in wave speed.
Resonance
The response of a body when a forcing frequency matches its natural frequency.
Shock Wave
The cone-shaped wave created by an object moving at supersonic speed through a fluid.
Sonic Boom
The loud sound resulting from the incidence of a shock wave.
Sound Wave
A longitudinal vibratory disturbance that travels in a medium, which can be heard in the approximate frequency range 20 – 20,000 Hertz.
Standing Wave
A stationary wave pattern formed in a medium when two sets of identical waves pass through the medium in opposite directions.
Transverse Wave
A wave in which the medium vibrates in a direction perpendicular (transverse) to the direction in which the wave travels. Ex: Light
Wave
A disturbance or vibration propagated from point to point in a medium or in space.
Wave Speed
The speed with which waves pass a particular point: Wave Speed = frequency * wavelength.
Wavelength
The distance between successive crests, troughs, or identical parts of the wave.