Question

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don’t stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?

Answer 1

This represents that he is on the second stage of scientific investigation of magnets. THE first stage is that he knows that magnet stick to another magnet and when the magnets are not sticking to the door of refrigerator it explains that He's on the 2nd Stage as he thinks that they made up of non magnetic material.