An equal loudness curve represents the sound intensity level required for a pure tone of any given frequency to be perceived as equally loud as a reference tone.
Describe the experimental procedure used to gather the data required to plot an equal loudness curve for a subject with normal hearing.
State the frequency at which the normal human ear is most sensitive, and explain how this sensitivity is reflected in the shape of an equal loudness curve.
Calculate the intensity of a sound wave that produces an intensity level of 55 dB55\text{ dB}55 dB. The threshold of hearing is I0=1.0×10−12 W m−2I_0 = 1.0 \times 10^{-12}\text{ W m}^{-2}I0=1.0×10−12 W m−2.
