Direct and Inverse Proportion

The sound intensity, $S$ , from a speaker is inversely proportional to the square of the distance, $r\,$ m, from the speaker.

$S\,$ is given by the formula: $S=144r2\displaystyle S = \frac{144}{r^2}$

Find the sound intensity when the speaker is 6 m away.

[2]

The sound intensity, $S$ , from a speaker is inversely proportional to the square of the distance, $r\,$ m, from the speaker.

$S\,$ is given by the formula: $S=144r2\displaystyle S = \frac{144}{r^2}$

Find the sound intensity when the speaker is 6 m away.

[2]

Direct and Inverse Proportion Questions