Direct and Inverse Proportion

67%

The intensity of light, $L$ , from a source is inversely proportional to the square of the distance, $d\,$ m, from the source.

$L\,$ is given by the formula: $L=200d2\displaystyle L = \frac{200}{d^2}$

Find the light intensity when the distance is 5 m.

[2]

67%

The intensity of light, $L$ , from a source is inversely proportional to the square of the distance, $d\,$ m, from the source.

$L\,$ is given by the formula: $L=200d2\displaystyle L = \frac{200}{d^2}$

Find the light intensity when the distance is 5 m.

[2]

Direct and Inverse Proportion Questions