GCSE Questions - Electromagnetic Spectrum
Q7.
(a) The diagram above represents an electromagnetic wave.
(i) Which arrow, K, L, M or N, shows the wavelength of the wave? [1 mark]
N ![](../../../graphics/symbols/nuclides/ticksmall.png)
(ii) Which arrow, K, L, M or N, shows the amplitude of the wave? [1 mark]
L ![](../../../graphics/symbols/nuclides/ticksmall.png)
(b) The diagram below represents the electromagnetic spectrum.
![](graphics/spectrum7.png)
A laser emits visible light.
Which letter, A, B or C, on the diagram represents visible light? [1 mark] B ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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.
![](graphics/laserphoto.png)
(i) How does the size of the angle of incidence compare with the size of the angle of reflection? [1 mark] They are equal. ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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]
The light is absorbed instead of reflected. ![](../../../graphics/symbols/nuclides/ticksmall.png)
(Total 5 marks)