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The velocity of electromagnetic waves in...

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

A

`3xx10^(6)` metre/second

B

`1.5xx10^(8)`metre/second

C

`6xx10^(6)` metre/second

D

`7.5xx10^(7)`metre/second

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The correct Answer is:
B
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