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5.2 The electromagnetic spectrum

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Question 2

A light-based sensor contains a transparent crystal covered by glass. An electromagnetic wave crosses from the crystal into the glass.

Its wavelength is 315 nm315\ \mathrm{nm}315 nm in the crystal and 420 nm420\ \mathrm{nm}420 nm in the glass.

Which pair gives the speed and frequency of the wave in the glass compared with in the crystal?

[1]
A

Speed in glass is 315420\dfrac{315}{420}420315​ times the speed in the crystal; frequency unchanged.

B

Speed unchanged; frequency in glass is 315420\dfrac{315}{420}420315​ times the frequency in the crystal.

C

Speed unchanged; frequency in glass is 420315\dfrac{420}{315}315420​ times the frequency in the crystal.

D

Speed in glass is 420315\dfrac{420}{315}315420​ times the speed in the crystal; frequency unchanged.

Markscheme

5.2 The electromagnetic spectrum Questions

  1. GCSE
  2. /Physics
  3. /5.2 The electromagnetic spectrum

84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.

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