The loudness ,L, of a sound (measured in decibels) is inversely proportional to the square of the distance, d, from the sound.

Question

A person 9 feet from jetski it is 80 decibels loud. How loud is the jetski when the person is 45 feet away?

Anwser is in dB

Answer 1

L₁(d₁)² = L₂(d₂)²

80(9)² = L₂(45)²

l2=3.2dB

Answer 2

Use my solution to a previous post as a model.