Waves the electromagnetic spectrum
1 mark · EasyWhat is the speed of electromagnetic waves in a vacuum?
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300,000,000 m/s (or 3.0 × 10^8 m/s)
Also accept: 3.0 × 10^8 m/s; 300,000,000 metres per second; 3.00 × 10^8 ms^-1
Common mistakes: 3.0 × 10^6 m/s
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Marking points
B1 · 1 mark · Correct value and correct unit for the speed of electromagnetic waves in a vacuum.
Worked solution
All electromagnetic waves travel at a speed of 3.0 × 10^8 m/s (300,000,000 m/s) in a vacuum.