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