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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 E.M. wave in a medium is given by
` v = (1)/( sqrt( mu epsilon)) = (1)/( sqrt( mu_(0) mu_(r) epsilon_(0) epsilon_(r)))= (c)/(sqrt(mu_(r) epsilon_(r)))=( 3 xx 10^(8))/(sqrt(4 xx 2.25))`
`= 1 xx 10^(8) ms^(-1)`
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