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The dielectric constant for air is 1.006...

The dielectric constant for air is 1.006. The speed of em wave travelling in air is `axx10^8ms^-1`, where a is about:

A

3

B

`3.88`

C

`2.5`

D

`3.2`

Text Solution

Verified by Experts

The correct Answer is:
A
For an electromagnetic wave,
velocity, `c = (1)/( sqrt (mu _0) epsi _(0)) = 3 xx 10 ^(8) ms ^(-1).`
Air acts almost as vacuum.
`therefore a =3` approximately.
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