The diagram shows plane wavefronts incident on a gap in a barrier.
To make the waves spread out less (i.e., to decrease the amount of diffraction that occurs after passing through the gap), which pair of changes must be made?
Decrease the frequency of the waves and decrease the width of the gap.
Increase the frequency of the waves and increase the width of the gap.
Increase the wavelength of the waves and increase the width of the gap.
Decrease the wavelength of the waves and decrease the width of the gap.
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.