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The speed of em wave in the unit of 10^8...

The speed of em wave in the unit of `10^8m//s`, in a medium of dielectric constant 2.25 and relative permeablity 4 is:

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The correct Answer is:
`1`
The speed of em wave in medium is given by
`v=1/(sqrt(mu in))=1/(sqrt(mu_0mu_r in_0in_r))=c/(sqrt(mu_r in_r))=(3xx10^8)/(sqrt(4xx2.25))`
`1xx10^8ms^-1`
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