Plane water waves in a ripple tank of uniform depth are incident normally on a barrier with a small gap. The width of the gap is approximately equal to the wavelength of the waves. Which of the following correctly describes the waves after they pass through the gap?
The wavelength and speed both increase, while the wave direction remains unchanged.
The frequency decreases and the wavelength increases, and the wave spreads out.
The wavelength and speed remain unchanged, and the waves spread out.
The wavelength decreases and the speed remains constant, and the wave continues in a narrow straight line.
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.