In a ripple tank, straight water waves travel from a region of deep water and pass over a submerged glass plate, where the water is shallower. The edge of the glass plate is angled with respect to the incoming wave crests.
What happens to the waves as they reach the boundary of the submerged plate?
They are diffracted because they speed up.
They are diffracted because they slow down.
They are refracted because they speed up.
They are refracted because they slow down.
237 exam-style questions on CIE IGCSE Physics General properties of waves, covering General properties of waves. Each one has a worked solution and a mark scheme showing where the marks go.