Water waves in a ripple tank travel from a shallow region (above a submerged plastic block) into a deeper region.
What happens to the waves as they cross the boundary into the deeper region?
They are diffracted because they slow down.
They are diffracted because they speed up.
They are refracted because they slow down.
They are refracted because they speed up.
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.