Dielectric constnat of air is 1.005 and velocity of electromagnetic wave propagating in air is `a xx 10^(10)cm//s` then a = …….

Options

A. 3
B. `3.55`
C. `2.5`
D. `2.8`

Answer

A

Explanation

As dielectric constant is 1.005 is considered as 1. So air medium behaves as vacuum and velocity of electromagnetic waves in vacuum is `3xx10^(8)m//s`. So comparing given speed `a xx 10^(8) m//s` with `3xx10^(8)m//s` we have a = 3.