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3.AUD-Decibels

Audiology SLP314

QuestionAnswer
Sound amplitude is expressed in what? Pressure.
Pascals (Pa) are units of what? (Sound) pressure.
Decibels are what kind of scale? Logarithmic (ratio). It compares two pressures.
What is the formula for dBs? dB = 20 log (P1/P2) Take the logarithm (base 10) of the ratio of two sound pressures and multiply it by 20.
What is the reference for measuring a single sound (zero point)? 20 μPa. The lowest sound pressure humans can hear.
How are sounds measured using the standard reference denoted? dB SPL (sound pressure level)
What is the maximum tolerable sound pressure for humans? 140 dB SPL.
How many dBs SPL is 20 μPa? 0.
What does a sound level meter do? It measures sound pressure and converts to dB SPL scale.
What's the relationship between intensity and loudness? Loudness is a subjective perception of intensity.
What is a hearing threshold? The lowest point one can hear.
What shape is the human audibility curve and why? Banana-shaped, because the outer and middle ears transmit middle frequencies more efficiently than low and high frequencies.
Created by: ashea01