The loudness of sound decreases as the distance from the source increases. Doubling the distance from a sound multiplies the relative intensity of the sound by one-fourth. If the sound of a speaker is recorded at 80 decibels at 4 feet, what is the decibel reading at 8 feet?
A)20 decibels
B)46 decibels
C)68 decibels
D)74 decibels

Question

Quizplus · Accepted Answer

Doubling the distance from a sound multiplies the relative intensity of the sound by one-fourth. So, the decibel reading at 8 feet is 80 - 6 = 74 decibels.

The Loudness of Sound Decreases as the Distance from the Source