The velocity of electromagnetic waves in...

The velocity of electromagnetic waves in a dielectric medium (refractive index `mu`= 4) is

A

`3 xx 10^(8)` metre/second

B

`1.5 xx 10^(8)` metra/second

C

`6 xx 10^(8)` metre/second

D

`7.5 xx 10^(7)` metre/second

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The correct Answer is:

D

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