GCSE Questions - Waves
(a) The diagram above represents an electromagnetic wave.
(i) Which arrow, K, L, M or N, shows the wavelength of the wave? [1 mark]
(ii) Which arrow, K, L, M or N, shows the amplitude of the wave? [1 mark]
(b) The diagram below represents the electromagnetic spectrum.
A laser emits visible light.
Which letter, A, B or C, on the diagram represents visible light? [1 mark]
(c) Laser light is used in some burglar alarms.
The photo shows laser light being reflected by a mirror. The light then reaches a detector.
(i) How does the size of the angle of incidence compare with the size of the angle of reflection? [1 mark]
(ii) When a burglar steps into the path of the laser light, the light no longer reaches the detector. Suggest one reason why. [1 mark]
(Total 5 marks)