Direct and Inverse Proportion

The intensity of radiation, $R$ , from a radioactive source is inversely proportional to the square of the distance, $d\,$ cm, from the source.

$R\,$ is given by the formula: $R=162d2\displaystyle R = \frac{162}{d^2}$

Find the radiation intensity when the distance is 3 cm.

[2]

The intensity of radiation, $R$ , from a radioactive source is inversely proportional to the square of the distance, $d\,$ cm, from the source.

$R\,$ is given by the formula: $R=162d2\displaystyle R = \frac{162}{d^2}$

Find the radiation intensity when the distance is 3 cm.

[2]

Direct and Inverse Proportion Questions