The Loudness of a Sound Can Be Quantified in Units $\mathrm { d } = 10 \log \frac { \mathrm { I } } { \mathrm { I } _ { 0 } }$

question 16

Multiple Choice

The loudness of a sound can be quantified in units called decibels, where the number of decibels d is given by the formula $\mathrm { d } = 10 \log \frac { \mathrm { I } } { \mathrm { I } _ { 0 } }$ What is the decibel rating of a sound having an intensity $\mathrm { I } = 1000 \mathrm { I } 0$ ?

• A) 13 decibels
• B) 3 decibels
• C) 30 decibels
• D) 1000 decibels

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Definitions:

Helmholtz

A German physicist and physician known for his contributions to the understanding of the mechanisms of vision and hearing among other areas.

Color Vision

The ability of organisms to differentiate colors, achieved through the varying sensitivities of photoreceptor cells in the eyes.

Opponent-Process Theory

The theory of color vision suggesting that three kinds of cells respond by increasing or decreasing their rate of firing when different colors are present.

Rhodopsin

A light-sensitive pigment found in the rods of the retina, critical for vision in low-light conditions.