Water waves in a ripple tank travel from a shallow region over a submerged plastic block into a deeper region of the tank.
What happens to the waves as they enter 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.