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5.2 The electromagnetic spectrum

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Question 4

An astronomical satellite detects three distinct electromagnetic signals, PPP, QQQ, and RRR, originating from a newly discovered stellar nebula:

  • Signal P P\,P has a wavelength of λP=2.5×10−8 m\lambda_P = 2.5 \times 10^{-8}\text{ m}λP​=2.5×10−8 m.
  • Signal Q Q\,Q has a frequency of fQ=1.2×1010 Hzf_Q = 1.2 \times 10^{10}\text{ Hz}fQ​=1.2×1010 Hz.
  • Signal R R\,R consists of photons that each have an energy of ER=1.5×10−20 JE_R = 1.5 \times 10^{-20}\text{ J}ER​=1.5×10−20 J.

Which option correctly identifies the regions of the electromagnetic spectrum to which these three signals belong?

A

PPP: Ultraviolet; QQQ: Microwave; RRR: Infrared

B

PPP: X-ray; QQQ: Microwave; RRR: Infrared

C

PPP: Ultraviolet; QQQ: Radio; RRR: Visible light

D

PPP: X-ray; QQQ: Radio; RRR: Visible light

Markscheme

5.2 The electromagnetic spectrum Questions

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

26 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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