Use the decibel scale to answer the question.
-How does the intensity of sound form a concert speaker at a distance of 1 meter compare to the intensity at a distance of 800 meters?
A)Factor of 10800 weaker at 800 m.
B)Factor of 640,000 weaker at 800 m.
C)Factor of 2400 weaker at 800 m.
D)Factor of 800 weaker at 800 m.

Question

Quizplus · Accepted Answer

The intensity of sound decreases with the square of the distance from the source, according to the inverse square law. Therefore, if the distance increases by a factor of 800 (from 1 meter to 800 meters), the intensity decreases by a factor of $800^2 = 640,000$, making choice B correct.

Use the Decibel Scale to Answer the Question