Final answer:
A shiny piece of metal reflects more light than a piece of cardboard because the smooth surface of the metal allows for clear reflection, in accordance with the law of reflection.
Step-by-step explanation:
Between a shiny piece of metal and a piece of cardboard, the metal reflects more light. This is because reflection is more efficient on smooth surfaces that can reflect light at specific angles. When light hits a shiny metal surface, it follows the law of reflection, resulting in a clear and direct reflection like that of a mirror. As opposed to a shiny piece of metal, cardboard has a rough surface that scatters light in multiple directions, a phenomenon known as diffuse reflection. Diffuse reflection enables us to see objects from various angles, but does not produce a clear reflection.
Thus, a shiny piece of metal is a better reflector than a piece of cardboard, confirming the observations of the take-home physics experiment involving the law of reflection.