Electricity & Magnetism
Advanced

Speed of Light (EM)

Light speed from vacuum constants.

Formula

c=1μ0ε0c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}}

Variables

\mu_0Permeability
\varepsilon_0Permittivity

Example

≈ 3×10⁸ m/s

Did You Know?

Maxwell computed light's speed purely from electric and magnetic constants, proving light is an electromagnetic wave.

lightmaxwellem