Atoms combine in many different ways to form different substances. Iron is a substance that can be found naturally and is considered an element. Brass is not an element, instead brass is a combination of two elements. What is the difference between iron and brass?

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared