# Discussion Questions: Inverse Square Law

• We've seen from the video that the Inverse Square Law applies to light. To what other types of energy can the Inverse Square Law be applied?

Gravity, sound, electric force, and radiation because they can radiate in all directions.

• Describe in your own words what is meant by, “The intensity falls in proportion to the inverse of the distance squared.”

The intensity of a source of energy is dependent on the distance from the source squared, and since it is diminishing with distance it must be dependent on the inverse of this number so that when the distance increases, the intensity decreases.

• Does a laser beam diminish in intensity according to the Inverse Square Law? Why or why not?

No. A laser beam of light does not spread vertically or horizontally, so there is no diminishing of its intensity with distance.

• Would you see a larger difference in light intensity if you

a. moved from 1 meter away to 2 meters away or

b. moved from 10 meters away to 11 meters away?