CAIE A-Level Physics 7.4.1 Properties of Electromagnetic Waves

Practise using the transverse nature and common free-space speed of electromagnetic waves to interpret propagation, spectra and wave relationships.

Exam points

state that electromagnetic waves are transverse and travel at the same speed c in free space
use their common speed and transverse nature to interpret a spectrum or propagation situation

[Maximum number: 1]

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

wavelength

period

$1.2 \times 10^{-10} \mathrm{Tm}$

2.5 Ms

1.2 pm

$2.5 \times 10^{11} \mathrm{Gs}$

$1.2 \times 10^{2} \mathrm{pm}$

$4.0 \times 10^{-10} \mathrm{~ns}$

$1.2 \times 10^{3} \mu \mathrm{~m}$

4.0 ns

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