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STD 12 - 8. Electromagnetic waves — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 8. Electromagnetic waves4 Marks
Question
Light is an electromagnetic wave. Its speed in vacuum is given by the expression
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Answer

${\mu _0} = 4\pi \times {10^{ - 7}},\,{\varepsilon _0} = 8.85 \times {10^{ - 12}}\frac{{N{\rm{ - }}{m^2}}}{{{C^2}}}$
so $c = \frac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }} = 3 \times {10^8}\frac{{meter}}{{sec}}.$

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