Activities

Measuring brightness with a grease spot photometer

A piece of white paper stained with oil or grease allows students to compare the intensity of light sources. The device takes seconds to make: just rub a small amount of oil or grease onto a piece of paper. Then place one light source on either side of the paper and observe whether the grease spot looks light or dark.

Under Construction

ChemistryPhysicsPhysical Science6–89–1220 min

Sticky tape part 1

Students explore electric charge with this simple introduction to the invisible world of electron transfer.