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CAIE A-Level Physics AS 7.4 Electromagnetic Spectrum Questions

Practise identifying shared electromagnetic-wave properties, ordering spectrum regions by wavelength or frequency and recognising the visible range.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • identify the transverse nature and common free-space speed of electromagnetic waves
  • order or select electromagnetic-spectrum regions from wavelength, frequency or energy and use their approximate ranges
  • identify visible wavelengths in the 400–700 nm free-space interval

Covered syllabus points

7.4.1—That all electromagnetic waves are transverse waves that travel with the7.4.2—The approximate range of wavelengths in free space of the principal regions7.4.3—That wavelengths in the range 400–700 nm in free space are visible to the

Question 1

[Maximum number: 1]

An electromagnetic wave is travelling through a vacuum.
What could be the wavelength and period of the electromagnetic wave?

wavelength

period

1.2×10−10Tm1.2 \times 10^{-10} \mathrm{Tm}

2.5 Ms

1.2 pm

2.5×1011Gs2.5 \times 10^{11} \mathrm{Gs}

1.2×102pm1.2 \times 10^{2} \mathrm{pm}

4.0×10−10 ns4.0 \times 10^{-10} \mathrm{~ns}

1.2×103μ m1.2 \times 10^{3} \mu \mathrm{~m}

4.0 ns

Question 2

[Maximum number: 1]

Make estimates of:

the wavelength of ultraviolet radiation.

Question 3

[Maximum number: 1]

What is the best estimate of the wavelength of green light?

A

260 nm

B

540 nm

C

780 nm

D

920 nm

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