alleryIn vacuum, the velocity of electromagnetic radiation is
A$3 \times 10^{8}\,m\,s^{-1}$
B$3 \times 10^{5}\,m\,s^{-1}$
C$3 \times 10^{6}\,m\,s^{-1}$
D$3 \times 10^{10}\,m\,s^{-1}$
Answer & Solution
Correct answer: A. $3 \times 10^{8}\,m\,s^{-1}$
All EM radiation travels at $c = 3 \times 10^{8}\,m\,s^{-1}$ in vacuum, regardless of wavelength.
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