A musician plays a flute near the open doorway of a large hall. A security guard stands outside the hall, in a position where they cannot directly see the flute player but they can still hear the sound.
State the wave phenomenon that allows the security guard to hear the sound from the flute around the corner of the doorway.
Calculate the frequency of a sound wave from the flute that has a wavelength of 0.85 m0.85\text{ m}0.85 m. The speed of sound in air is 340 m/s340\text{ m/s}340 m/s.
The width of the open doorway is 0.85 m0.85\text{ m}0.85 m. Explain why the guard can hear the frequency calculated in (a)(ii) clearly around the corner, but finds a higher frequency sound of 4000 Hz4000\text{ Hz}4000 Hz much harder to hear.
To see the flute player, a flat vertical mirror is placed at a position PPP on the wall opposite the doorway.
State the law of reflection that determines the angle of the mirror.
Describe the path and direction of the light ray that enables the guard to see the flute player.
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.