A person stands in a corridor, around a corner from an open doorway of a room. A loudspeaker in the room produces sound waves that pass through the doorway, spreading out so that they can be heard by the person in the corridor.
What is the name of this spreading effect, and how should the frequency of the sound waves be changed so that the sound waves spread less, making them quieter for the person in the corridor?
Name of effect: diffraction; Change to the frequency: increase the frequency
Name of effect: diffraction; Change to the frequency: decrease the frequency
Name of effect: refraction; Change to the frequency: increase the frequency
Name of effect: refraction; Change to the frequency: decrease the frequency
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.