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In December 2014, the average price of gasoline in the United States was $2.50 per gallon and consumers bought 7 percent more gasoline than they had during April 2014, when the average price was $3.60 per gallon.Based on these figures, from April 2014 to December 2014, the demand for gasoline was
Loudness
A perceptual attribute of sounds that is primarily a physiological correlate of sound pressure level, measured in decibels.
Pitch
The perception of how high or low a sound is, depending on the frequency of the sound wave.
Hertz
The unit of frequency in the International System of Units (SI), equating to one cycle per second.
Auditory Neuron
a nerve cell that is involved in the process of hearing, transmitting auditory signals from the ear to the brain.
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