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5.2 The electromagnetic spectrum

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Question 30
H

A filter transmits 80% of red light and 20% of blue light. A second identical filter is placed behind it. Each filter transmits the stated percentage of the energy reaching that filter.

Equal energies of red and blue light reach the first filter.

What is the ratio of red-light energy to blue-light energy after both filters?

[1]
A

4:14:14:1

B

16:116:116:1

C

1:41:41:4

D

1:161:161:16

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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