The dielectric constant of air is 1.006. The speed of Electromagnetic Wave travelling in air is $a × 10^8 ms^{-1}$, where a is about
Answer & explanation
Correct answer: option 1
For an Electromagnetic Wave (in vacuum),
$Velocity \, c =\frac{1}{\sqrt{\mu_0ε_0}}= 3 × 10^8 ms^{-1}$
Air acts almost as vacuum, hence
$a = 3(approx)$