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GCSE Questions - Waves

Q5.

(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

(ii) Which arrow, K, L, M or N, shows the amplitude of the wave? [1 mark]

L

(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] B

 

(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] They are equal.

(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.

(Total 5 marks)