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SAT® Subject Test in Physics

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Moderate

Inverse Square Relationship

SATPHY-GAVKXE

The intensity of light due to a point light source is inversely proportional to the square of the distance from the source.

If the intensity of light due to a point light source is $16\ Watts/m^{2}$ at a distance of $3.0\ m$ from the source, what is the intensity at a distance of $12.0\ m$ from the source?

A

$8.0 Watts/m^{2}$

B

$4.0 Watts/m^{2}$

C

$2.0 Watts/m^{2}$

D

$1.0 Watts/m^{2}$

E

$32 Watts/m^{2}$