Activities
Under ConstructionPhysicsAstronomyPhysical Science30 min
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 ConstructionEarth ScienceAstronomy6–89–1240 min
Which is bigger, the moon or the sun? Introduction to angular size
Students use graph paper targets to compare the angular size to the true size for objects at different distances