Light is an electromagnetic wave. Its speed in vacuum is given by the expression
- A$\sqrt {{\mu _0}{\varepsilon _0}} $
- B$\sqrt {\frac{{{\mu _0}}}{{{\varepsilon _0}}}} $
- C$\sqrt {\frac{{{\varepsilon _0}}}{{{\mu _0}}}} $
- D$\frac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }}$
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($I$: intensity of an electromagnetic wave,$c$: speed of light)
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