A scientist performs three double-slit experiments. The rst is done using water. The second is done using light and the last using electrons. What common feature of all three experiments will the scientist observe? All three will involve the same slit opening size. All three involve waves travelling through a medium. All three involve waves travelling at the same speeds. All three experiments involve the same laws of physics. The pattern formed behind the slits will be the same shape for all three cases. @@@@