Question

Sound. Sound intensity (loudness) varies inversely as the square of the distance from the source. If a rock band has a sound intensity of 100 decibels 30 feet away from the amplifier, find the sound intensity 60 feet away from the amplifier.

Answer 1

Do you know the formula for sound?

Answer 2

It's a variation problem.
The formula they give me are:
varies directly: d=kf
varies inversely: I=k/R
joint variation: g=khr^2
combined variation: y=kx/z

Answer 3

okay, so we will be using l=k/r

Answer 4

\[100=\frac{ k }{ 30 }\]

Answer 5

3000=k

Answer 6

thank you