We use the decibel scale to quantify amplitude because:

a. the dynamic range of human hearing is so large that without decibels, calculations would be cumbersome and prone to error

b. in the US anyway, it is required by ANSI

c. there is only one decibel scale so it makes “decibel exchanges” easy to accomplish

d. decibel behavior is predicted by simple harmonic motion

Option A) the dynamic range of human hearing is so large that without decibels, calculations would be cumbersome and prone to error

Explanation:

Amplitude refers to the maximum displacement of a wave i.e how forceful a wave is. Hence, amplitude is associated with ranges of sound and noise, that can be picked by the human ear.

Thus, amplitude is measured in decibels.

Option A.

Explanation:

Decibel scale is the unit used to measure sound intensity. It is use to quantify amplitude of sound. Amplitude refers to ranges of sound and noise human ear can hear..Human ear is very sensitive and the ear can hear everything even the slightest finger tips. On the scale , the near audible sound i.e silence is 0db.

A whisper is 15db, normal conversation is 60db, a car horn is 110db. Amplitude is measured in decibels.

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