Let the initial intensity be I, then,
[tex]I=\frac{x}{d^2}[/tex]Here, x is the proportionality constant and d is the distance.
When the seat is changed o one that is thrice as far from the
speakers, we have the new intensity as,
[tex]I^{\prime}=\frac{x}{(3d)^2}=\frac{x}{9d^2}[/tex]Therefore, the new intensity in terms of the original intensity can be written as,
[tex]I^{\prime}=\frac{x}{9d^2}=\frac{1}{9}\times I[/tex]Thus, the required fraction is 1/9.
