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  • The dielectric constant of air is 1.006. The speed of Electromagnetic Wave travelling in air is <img alt="a \times 10^8 \mathrm{~ms}^{-1}" src="https://entrancecorner.oncodecogs.com/gif.latex?

The dielectric constant of air is 1.006. The speed of Electromagnetic Wave travelling in air is a \times 10^8 \mathrm{~ms}^{-1}  where a is about

Option: 1

3


Option: 2

3.88


Option: 3

2.5


Option: 4

3.2


Answers (1)

best_answer

For an Electromagnetic Wave (in vacuum),
Velocity \mathrm{c=\frac{1}{\sqrt{\mu_0 \varepsilon_0}}=3 \times 10^8 \mathrm{~ms}^{-1}}
Air acts almost as vacuum, hence a=3 (approx)

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shivangi.shekhar

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