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Sound Definitions

Sound A form of energy that travels by longitudinal mechanical waves
Natural Frequency Frequency at which a body oscillates when vibrating freely
Resonance Rapid amplification of oscillation when a periodic force is applied at the same frequency as the natural frequency of a body
Stationary Wave A wave that remains in a constant position
Node A point on a stationary wave where there is no vibration
Antinode A point on a stationary wave where there is maximum vibration
Fundamental Frequency The lowest natural frequency of a vibrating object
Harmonics Multiples of the fundamental frequency
Quality Describes the shape of a sound wave; it depends on the number and the amplitudes of the harmonics present
Sound Intensity Rate at which sound energy passes through a unit area at right angles to the direction of the propagation of the wave
Threshold of Hearing The smallest sound intensity detectable by the average human ear at a frequency of 1 kHz
Sound Intensity Level Scale that compares a particular sound intensity to the threshold of hearing
dB(A) Scale A sound intensity level scale that has been adapted for the ear's frequency response
Created by: conordesmond